Move 'use strict' to file level

Change-Id: I1f0dae4aa168e77c112bcd3688c98b84e4ce5f36
diff --git a/dev/js/src/match/attachement.js b/dev/js/src/match/attachement.js
index 9211728..70a2a20 100644
--- a/dev/js/src/match/attachement.js
+++ b/dev/js/src/match/attachement.js
@@ -9,9 +9,9 @@
  *
  * @author Nils Diewald
  */
-define(function () {
+"use strict";
 
-  "use strict";
+define(function () {
 
   const uriRE = new RegExp("^data: *([^;,]*?(?: *; *[^,;]+?)*) *, *(.+)$");
   const mapRE = new RegExp("^ *([^=]+?) *= *(.+?) *$");