Add missing classes to routeTo url setting container

Author: angusmcleod

assets/javascripts/discourse/templates/components/wizard-custom-action.hbs

@@ -327,7 +327,7 @@
 {{/if}}
 
 {{#if routeTo}}
-  <div class="setting">
+  <div class="setting full field-mapper-setting">
     <div class="setting-label">
       <label>{{i18n "admin.wizard.action.route_to.url"}}</label>
     </div>