Disable landscape orientation on all platforms.

config.xml

@@ -20,7 +20,7 @@
   <preference name="xwalkCommandLine" value="--disable-pull-to-refresh-effect"/>
   <preference name="xwalkMode" value="embedded"/>
   <preference name="xwalkMultipleApk" value="true"/>
-  <preference name="Orientation" value="default"/>
+  <preference name="Orientation" value="portrait"/>
   <feature name="StatusBar">
     <param name="ios-package" onload="true" value="CDVStatusBar"/>
   </feature>
@@ -48,7 +48,6 @@
     <splash src="resources/android/splash/drawable-port-xxxhdpi-screen.png" density="port-xxxhdpi"/>
   </platform>
   <platform name="ios">
-    <preference name="Orientation" value="all"/>
     <preference name="BackupWebStorage" value="none"/>
     <preference name="KeyboardDisplayRequiresUserAction" value="false"/>
     <preference name="iosPersistentFileLocation" value="Library"/>
@@ -80,4 +79,4 @@
     <splash src="resources/ios/splash/Default~iphone.png" width="320" height="480"/>
   </platform>
   <icon src="resources/android/icon/drawable-xhdpi-icon.png"/>
-</widget>
+</widget>