Refactor dispatcher project boards path

app/assets/javascripts/dispatcher.js

@@ -167,8 +167,10 @@ import Activities from './activities';
           break;
         case 'projects:boards:show':
         case 'projects:boards:index':
-          shortcut_handler = new ShortcutsNavigation();
-          new UsersSelect();
+          import('./pages/projects/boards/index')
+            .then(callDefault)
+            .catch(fail);
+          shortcut_handler = true;
           break;
         case 'projects:merge_requests:index':
         case 'projects:issues:index':

app/assets/javascripts/pages/projects/boards/index.js

+import UsersSelect from '~/users_select';
+import ShortcutsNavigation from '~/shortcuts_navigation';
+
+export default () => {
+  new UsersSelect(); // eslint-disable-line no-new
+  new ShortcutsNavigation(); // eslint-disable-line no-new
+};