Removed unnecessary semicolons.

src/assets/js/backend_categories_helper.js

@@ -23,7 +23,7 @@
      */
     function CategoriesHelper() {
         this.filterResults = {};
-    };
+    }
 
     /**
      * Binds the default event handlers of the categories tab.

src/assets/js/backend_customers_helper.js

@@ -22,7 +22,7 @@
      */
     function CustomersHelper() {
         this.filterResults = {};
-    };
+    }
 
     /**
      * Binds the default event handlers of the backend customers page.

src/assets/js/backend_services_helper.js

@@ -22,7 +22,7 @@
      */
     function ServicesHelper() {
         this.filterResults = {};
-    };
+    }
 
     ServicesHelper.prototype.bindEventHandlers = function() {
         var instance = this;