FIX: review queue scrolling is not working after take an action. (#16346)

`reject` method for `Reviewable` model is returning an array. So if we use `this.set` method to update `reviewables` attribute in controller then it replaces the model with an array of objects wrongly. This is now fixed by using the `setObjects` method of the model.

app/assets/javascripts/discourse/app/controllers/review-index.js

@@ -111,7 +111,7 @@ export default Controller.extend({
       if (newList.length === 0) {
         this.refreshModel();
       } else {
-        this.set("reviewables", newList);
+        this.reviewables.setObjects(newList);
       }
     },