Remove use strict in extensions (part 2)

We compile using alwaysStrict so this directive is not needed

extensions/html-language-features/server/src/modes/formatting.ts

@@ -2,7 +2,8 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
-'use strict';
+
+
 
 import { TextDocument, Range, TextEdit, FormattingOptions, Position } from 'vscode-languageserver-types';
 import { LanguageModes, Settings, LanguageModeRange } from './languageModes';