Fix eslint no-new in es5 files

[MAILPOET-1146]

.eslintrc.es5.json

@@ -20,7 +20,6 @@
     "no-restricted-syntax": 0,
     "no-useless-concat": 0,
     "no-nested-ternary": 0,
-    "no-new": 0,
     "no-redeclare": 0,
     "no-console": 0,
     "no-empty": 0,

assets/js/src/form_editor/form_editor.js

@@ -796,7 +796,7 @@ WysijaForm.DraggableItem = window.Class.create({
         window.Droppables.hideArea();
       },
       starteffect: function (element) {
-        new window.Effect.Opacity(element, {
+        new window.Effect.Opacity(element, {// eslint-disable-line no-new
           duration: 0.2,
           from: element.getOpacity(),
           to: 0.7