Remove use strict directives in main vs code ts files

We compile using the alwaysStrict flag so these directives are not needed

src/vs/code/electron-browser/issue/issueReporterMain.ts

@@ -3,8 +3,6 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-'use strict';
-
 import 'vs/css!./media/issueReporter';
 import { shell, ipcRenderer, webFrame, clipboard } from 'electron';
 import { localize } from 'vs/nls';