Disable global GoogleDrive instance

@hedgerh please do something with it later :)

src/plugins/Modal.js

@@ -2,7 +2,7 @@ import Plugin from './Plugin'
 import { ModalTemplate } from './templates'
 import Drive from './GoogleDrive'
 
-let GoogleDrive = new Drive()
+// let GoogleDrive = new Drive()
 
 export default class Modal extends Plugin {
   constructor (core, opts) {