DEV: Use @action decorator (#11955)

Follow up to db7b7eed9d

app/assets/javascripts/select-kit/addon/components/email-group-user-chooser-filter.js

@@ -1,9 +1,10 @@
 import MultiSelectFilterComponent from "select-kit/components/multi-select/multi-select-filter";
+import { action } from "@ember/object";
 
 export default MultiSelectFilterComponent.extend({
   classNames: ["email-group-user-chooser-filter"],
 
-  actions: {
+  @action
   onPaste(event) {
     const data = event.originalEvent.clipboardData;
 
@@ -31,5 +32,4 @@ export default MultiSelectFilterComponent.extend({
       return false;
     }
   },
-  },
 });