move entry point to top of file

lib/generators/webstarterkit/web/scripts/main.dart

 import 'dart:html';
 
+main() {
+  initWsk();
+}
+
 initWsk() {
   var navdrawerContainer = querySelector('.navdrawer-container');
   var appbarElement = querySelector('.app-bar');
@@ -27,7 +31,3 @@ initWsk() {
     }
   });
 }
-
-main() {
-  initWsk();
-}
\ No newline at end of file