fix(datepickerPopup): register popup module

Closes #5745

Author: aitboudad

src/datepickerPopup/index-nocss.js

@@ -1,6 +1,7 @@
 require('../datepicker/index-nocss.js');
 require('../position/index-nocss.js');
 require('../../template/datepickerPopup/popup.html.js');
+require('./popup.js');
 
 var MODULE_NAME = 'ui.bootstrap.module.datepickerPopup';