Fix NOOP import

Fixes phaserjs#5170

Author: samme

src/input/keyboard/KeyboardManager.js

@@ -9,7 +9,7 @@ var Class = require('../../utils/Class');
 var GameEvents = require('../../core/events');
 var InputEvents = require('../events');
 var KeyCodes = require('../../input/keyboard/keys/KeyCodes');
-var NOOP = require('../../utils/Class');
+var NOOP = require('../../utils/NOOP');
 
 /**
  * @classdesc

src/input/mouse/MouseManager.js

@@ -7,7 +7,7 @@
 var Class = require('../../utils/Class');
 var Features = require('../../device/Features');
 var InputEvents = require('../events');
-var NOOP = require('../../utils/Class');
+var NOOP = require('../../utils/NOOP');
 
 //  https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent
 //  https://github.com/WICG/EventListenerOptions/blob/gh-pages/explainer.md