A11Y: Use autocomplete=off more widely (#15780)

app/assets/javascripts/admin/addon/templates/components/admin-editable-field.hbs

@@ -1,7 +1,7 @@
 <div class="field">{{i18n name}}</div>
 <div class="value">
   {{#if editing}}
-    {{text-field value=buffer autofocus="autofocus" autocomplete="discourse"}}
+    {{text-field value=buffer autofocus="autofocus" autocomplete="off"}}
   {{else}}
     <a href {{action "edit"}} class="inline-editable-field">
       <span>{{value}}</span>

app/assets/javascripts/admin/addon/templates/components/simple-list.hbs

@@ -26,9 +26,10 @@
     value=newValue
     placeholderKey="admin.site_settings.simple_list.add_item"
     class="add-value-input"
-    autocomplete="discourse"
+    autocomplete="off"
     autocorrect="off"
-    autocapitalize="off"}}
+    autocapitalize="off"
+  }}
 
   {{d-button
       action=(action "addValue")

app/assets/javascripts/admin/addon/templates/components/themes-list.hbs

@@ -20,7 +20,8 @@
       {{input
         class="filter-input"
         placeholder=(i18n "admin.customize.theme.filter_placeholder")
-        autocomplete="discourse"
+        autocomplete="off"
+        type="search"
         value=(mut filterTerm)
       }}
       {{d-icon "search"}}