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/processExplorer/processExplorerMain.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/processExplorer';
 import { listProcesses, ProcessItem } from 'vs/base/node/ps';
 import { webFrame, ipcRenderer, clipboard } from 'electron';