Fix ESLint newline-per-chained-call ES5

[MAILPOET-1031]

.eslintrc.es5.json

@@ -19,7 +19,6 @@
     "guard-for-in": 0,
     "no-prototype-builtins": 0,
     "no-restricted-syntax": 0,
-    "newline-per-chained-call": 0,
     "no-useless-concat": 0,
     "no-multi-spaces": 0,
     "no-nested-ternary": 0,

assets/js/src/newsletter_editor/behaviors/ResizableBehavior.js

@@ -50,7 +50,8 @@ define([
         if (newLength < that.options.minLength) newLength = that.options.minLength;
 
         that.view.model.set(that.options.modelField, newLength + 'px');
-      }).on('resizeend', function(event) {
+      })
+      .on('resizeend', function(event) {
         that.isBeingResized = null;
         that.$el.removeClass('mailpoet_resize_active');
       });