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/sharedProcess/sharedProcessMain.ts

@@ -3,8 +3,6 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-'use strict';
-
 import * as fs from 'fs';
 import * as platform from 'vs/base/common/platform';
 import product from 'vs/platform/node/product';