Issue #3449491: ResponsiveMenus sometimes adds multiple click handlers to the toggle and accordion controls breaking them

This makes changes to at_core/scripts/at.responsiveMenu.js but does not make corresponding changes to at_core/scripts/min/at.responsiveMenu.min.js. In order to ensure it works, I also changed at_core/at_core.libraries.yml to use the main file instead of the minified file.

at_core/scripts/at.responsiveMenus.js

@@ -2,7 +2,7 @@
  * @file
  * Responsive menus.
  */
-(function ($, document, window) {
+(function ($, document, window, once) {
 
   "use strict";
 
@@ -50,7 +50,7 @@
           }
         });
       }
-      $(tl, context).on('click', toggleClick);
+      $(once('atrm-toggle', tl, context)).on('click', toggleClick);
 
       // Accordion toggles.
       function accordionClick(e) {
@@ -94,7 +94,7 @@
           if (acd_def == true && acd_load == true) {
             $('.rm-block .menu-level-1').addClass('ms-accordion');
             $.ready(copyButtons('.ms-accordion .is-parent__wrapper .menu__link'));
-            $('.ms-accordion .rm-accordion-trigger', context).on('click', accordionClick);
+            $(once('atrm-accordion', '.ms-accordion .rm-accordion-trigger', context)).on('click', accordionClick);
           }
         },
         // The resp menu system only uses one breakpoint, if it matches this
@@ -109,7 +109,7 @@
                   if (acd_both == false) {
                     $('.rm-block .menu-level-1').addClass('ms-accordion');
                     $.ready(copyButtons('.ms-accordion .is-parent__wrapper .menu__link'));
-                    $('.ms-accordion .rm-accordion-trigger', context).on('click', accordionClick);
+                    $(once('atrm-accordion', '.ms-accordion .rm-accordion-trigger', context)).on('click', accordionClick);
                   }
                 } else {
                   $('.ms-accordion .rm-accordion-trigger').remove();
@@ -135,7 +135,7 @@
               if (acd_both == false) {
                 $('.rm-block .menu-level-1').addClass('ms-accordion');
                 $.ready(copyButtons('.ms-accordion .is-parent__wrapper .menu__link'));
-                $('.ms-accordion .rm-accordion-trigger', context).on('click', accordionClick);
+                $(once('atrm-accordion', '.ms-accordion .rm-accordion-trigger', context)).on('click', accordionClick);
               }
             } else {
               $('.ms-accordion .rm-accordion-trigger').remove();
@@ -157,4 +157,4 @@
       });
     }
   };
-}(jQuery, document, window));
+}(jQuery, document, window, once));