Remove use strict in extensions (part 2)

We compile using alwaysStrict so this directive is not needed

extensions/emmet/src/locateFile.ts

@@ -5,7 +5,8 @@
 
 // Based on @sergeche's work on the emmet plugin for atom
 // TODO: Move to https://github.com/emmetio/file-utils
-'use strict';
+
+
 
 import * as path from 'path';
 import * as fs from 'fs';