settings: Remove unused admin-table-wrapper class.

This class is not used anywhere, so there is no need for
this.

web/templates/settings/auth_methods_settings_admin.hbs

@@ -11,7 +11,7 @@
     </div>
     {{/unless}}
     <form class="admin-realm-form org-authentications-form">
-        <div id="org-auth_settings" class="admin-table-wrapper settings-subsection-parent">
+        <div id="org-auth_settings" class="settings-subsection-parent">
             <div class ="subsection-header">
                 <h3>{{t "Authentication methods" }}</h3>
                 {{> settings_save_discard_widget section_name="auth_settings" }}

web/templates/settings/linkifier_settings_admin.hbs

@@ -1,5 +1,5 @@
 <div id="linkifier-settings" class="settings-section" data-name="linkifier-settings">
-    <div class="admin-table-wrapper">
+    <div>
 
         <p>
             {{t "Configure regular expression patterns that will be used to

web/templates/settings/playground_settings_admin.hbs

@@ -1,5 +1,5 @@
 <div id="playground-settings" class="settings-section" data-name="playground-settings">
-    <div class="admin-table-wrapper">
+    <div>
         <p>
             {{#tr}}
                 Code playgrounds are interactive in-browser development environments,

web/templates/settings/profile_field_settings_admin.hbs

@@ -6,7 +6,7 @@
         <button class="button rounded sea-green" id="add-custom-profile-field-btn">{{t "Add a new profile field" }}</button>
         {{/if}}
     </div>
-    <div class="admin-table-wrapper" data-simplebar data-simplebar-tab-index="-1">
+    <div data-simplebar data-simplebar-tab-index="-1">
         <table class="table table-striped admin_profile_fields_table">
             <thead>
                 <tr>