Move 'use strict' to file level

Change-Id: I1f0dae4aa168e77c112bcd3688c98b84e4ce5f36
diff --git a/dev/js/src/init.js b/dev/js/src/init.js
index df56b80..58c6472 100644
--- a/dev/js/src/init.js
+++ b/dev/js/src/init.js
@@ -15,6 +15,7 @@
  * - obj.alignment() // toggle
  */
 
+"use strict";
 define([
   'match',
   'hint',