ESLint rules: array-callback-return, no-invalid-this, func-style (#3151)

* satisfied array-callback-return rule
* satisfying no-invalid-this rule
* fixed invalid-this issues
* changed isNotEqual to arrow function
* added rule func-style
* added return false to satisfy array-callback-return rule

Co-authored-by: Joel McKinnon <jmckinnon@apple.com>
Co-authored-by: Joshi <simplyrender@gmail.com>
Co-authored-by: Andrew Henry <akhenry@gmail.com>

platform/forms/src/FileInputService.js

@@ -47,6 +47,7 @@ define(["zepto"], function ($) {
         return new Promise(function (resolve, reject) {
             input.trigger("click");
             input.on('change', function (event) {
+                // eslint-disable-next-line no-invalid-this
                 file = this.files[0];
                 input.remove();
                 if (file) {