🐛 Add missing showInStore attributes

Add missing showInStore attributes on Braintree configuration as there
are some values that are changeable on store view (Title, Descriptors,
merchant name override) and are not accessible from store view level.

app/code/Magento/Braintree/etc/adminhtml/system.xml

@@ -44,7 +44,7 @@
                         <comment>http://docs.magento.com/m2/ce/user_guide/payment/braintree.html</comment>
                         <frontend_model>Magento\Paypal\Block\Adminhtml\System\Config\Fieldset\Hint</frontend_model>
                     </group>
-                    <group id="braintree_required" translate="label" showInDefault="1" showInWebsite="1" sortOrder="5">
+                    <group id="braintree_required" translate="label" showInDefault="1" showInWebsite="1" showInStore="1" sortOrder="5">
                         <label>Basic Braintree Settings</label>
                         <attribute type="expanded">1</attribute>
                         <frontend_model>Magento\Config\Block\System\Config\Form\Fieldset</frontend_model>
@@ -77,7 +77,7 @@
                             <backend_model>Magento\Config\Model\Config\Backend\Encrypted</backend_model>
                         </field>
                     </group>
-                    <group id="braintree_advanced" translate="label" showInDefault="1" showInWebsite="1" sortOrder="20">
+                    <group id="braintree_advanced" translate="label" showInDefault="1" showInWebsite="1" showInStore="0" sortOrder="20">
                         <label>Advanced Braintree Settings</label>
                         <frontend_model>Magento\Config\Block\System\Config\Form\Fieldset</frontend_model>
                         <field id="braintree_cc_vault_title" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="0">
@@ -125,7 +125,7 @@
                             <config_path>payment/braintree/sort_order</config_path>
                         </field>
                     </group>
-                    <group id="braintree_country_specific" translate="label" showInDefault="1" showInWebsite="1" sortOrder="30">
+                    <group id="braintree_country_specific" translate="label" showInDefault="1" showInWebsite="1" showInStore="0" sortOrder="30">
                         <label>Country Specific Settings</label>
                         <frontend_model>Magento\Config\Block\System\Config\Form\Fieldset</frontend_model>
                         <field id="allowspecific" translate="label" type="allowspecific" sortOrder="200" showInDefault="1" showInWebsite="1" showInStore="0">
@@ -146,7 +146,7 @@
                             <config_path>payment/braintree/countrycreditcard</config_path>
                         </field>
                     </group>
-                    <group id="braintree_paypal" translate="label" showInDefault="1" showInWebsite="1" sortOrder="40">
+                    <group id="braintree_paypal" translate="label" showInDefault="1" showInWebsite="1" showInStore="1" sortOrder="40">
                         <label>PayPal through Braintree</label>
                         <frontend_model>Magento\Config\Block\System\Config\Form\Fieldset</frontend_model>
                         <field id="title" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
@@ -215,7 +215,7 @@
                             <config_path>payment/braintree_paypal/skip_order_review</config_path>
                         </field>
                     </group>
-                    <group id="braintree_3dsecure" translate="label" showInDefault="1" showInWebsite="1" sortOrder="41">
+                    <group id="braintree_3dsecure" translate="label" showInDefault="1" showInWebsite="1" showInStore="0" sortOrder="41">
                         <label>3D Secure Verification Settings</label>
                         <frontend_model>Magento\Config\Block\System\Config\Form\Fieldset</frontend_model>
                         <field id="verify_3dsecure" translate="label" type="select" sortOrder="150" showInDefault="1" showInWebsite="1" showInStore="0">
@@ -239,7 +239,7 @@
                             <config_path>payment/braintree/verify_specific_countries</config_path>
                         </field>
                     </group>
-                    <group id="braintree_dynamic_descriptor" translate="label" showInDefault="1" showInWebsite="1" sortOrder="50">
+                    <group id="braintree_dynamic_descriptor" translate="label" showInDefault="1" showInWebsite="1" showInStore="1" sortOrder="50">
                         <label>Dynamic Descriptors</label>
                         <comment><![CDATA[Dynamic descriptors are sent on a per-transaction basis and define what will appear on your customers credit card statements for a specific purchase.
                             The clearer the description of your product, the less likely customers will issue chargebacks due to confusion or non-recognition.