Move 'use strict' to file level

Change-Id: I1f0dae4aa168e77c112bcd3688c98b84e4ce5f36
diff --git a/dev/js/src/plugin/widget.js b/dev/js/src/plugin/widget.js
index 546cd1b..5f8ca9a 100644
--- a/dev/js/src/plugin/widget.js
+++ b/dev/js/src/plugin/widget.js
@@ -7,9 +7,9 @@
  *
  * @author Nils Diewald
  */
+"use strict";
 
 define(["view","plugin/service","util"], function (viewClass, serviceClass) {
-  "use strict";
 
   return {