Move 'use strict' to file level

Change-Id: I1f0dae4aa168e77c112bcd3688c98b84e4ce5f36
diff --git a/package.json b/package.json
index d158502..703962a 100755
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "Kalamar",
   "description": "Mojolicious-based Frontend for KorAP",
   "license": "BSD-2-Clause",
-  "version": "0.40.2",
+  "version": "0.40.3",
   "pluginVersion": "0.2.2",
   "engines": {
     "node": ">=6.0.0"