Remove shared helper for margin

- removes the shared helper call to set margin, as this is now handled by the component wrapper helper, which all of these components already use
- one of these didn't seem to be using the shared helper at all

app/views/components/_expander.html.erb

@@ -2,16 +2,13 @@
 <%
   title ||= false
   open_on_load ||= false
-  margin_bottom ||= 0
 
   content_id = "expander-content-#{SecureRandom.hex(4)}"
-  shared_helper = GovukPublishingComponents::Presenters::SharedHelper.new(local_assigns)
 
   component_helper = GovukPublishingComponents::Presenters::ComponentWrapperHelper.new(local_assigns)
   component_helper.add_data_attribute({ module: "expander" })
   component_helper.add_data_attribute({ "open-on-load": open_on_load })
   component_helper.add_class("app-c-expander")
-  component_helper.add_class(shared_helper.get_margin_bottom) unless margin_bottom == 0
   component_helper.add_data_attribute({ "button-data-attributes": button_data_attributes }) if local_assigns.include?(:button_data_attributes)
 %>
 <% if title %>

app/views/components/_filter_panel.html.erb

@@ -13,12 +13,9 @@
   raise ArgumentError, "reset_link_href is required" if show_reset_link && !local_assigns[:reset_link_href]
 
   component_helper = GovukPublishingComponents::Presenters::ComponentWrapperHelper.new(local_assigns)
-  shared_helper = GovukPublishingComponents::Presenters::SharedHelper.new(local_assigns)
   component_helper.add_data_attribute({ module: "filter-panel ga4-event-tracker" })
   component_helper.add_class("app-c-filter-panel")
-  component_helper.add_class(shared_helper.get_margin_bottom) if local_assigns[:margin_bottom]
 %>
-
 <%= tag.div(**component_helper.all_attributes) do %>
   <div class="app-c-filter-panel__header">
     <%= tag.button(

app/views/components/_filter_section.html.erb

@@ -1,7 +1,6 @@
 <% add_app_component_stylesheet("filter-section") %>
 <%
   raise ArgumentError, "heading_text is required" unless local_assigns[:heading_text]
-  shared_helper = GovukPublishingComponents::Presenters::SharedHelper.new(local_assigns)
   open ||= nil
   status_text ||= ""
   heading_level ||= 2

app/views/components/_filter_summary.html.erb

@@ -9,13 +9,10 @@
   reset_link_href ||= nil
   reset_link_text ||= "Clear all filters"
 
-  shared_helper = GovukPublishingComponents::Presenters::SharedHelper.new(local_assigns)
   component_helper = GovukPublishingComponents::Presenters::ComponentWrapperHelper.new(local_assigns)
-  component_helper.add_class(shared_helper.get_margin_bottom) if local_assigns[:margin_bottom]
   component_helper.add_data_attribute({ module: "ga4-event-tracker" })
   component_helper.add_class("app-c-filter-summary")
 %>
-
 <%= tag.div(**component_helper.all_attributes) do %>
   <%= content_tag("h#{heading_level}", heading_text, class: "app-c-filter-summary__heading") %>