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/issueReporterModel.ts

@@ -3,8 +3,6 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-'use strict';
-
 import { assign } from 'vs/base/common/objects';
 import { ILocalExtension } from 'vs/platform/extensionManagement/common/extensionManagement';
 import { IssueType, ISettingSearchResult } from 'vs/platform/issue/common/issue';