fix(tooltip): missed dependency for cjs

Closes #5999

Author: fedyk

src/modal/index-nocss.js

@@ -5,6 +5,6 @@ require('./modal');
 
 var MODULE_NAME = 'ui.bootstrap.module.modal';
 
-angular.module(MODULE_NAME, ['ui.bootstrap.modal', 'uib/template/modal/backdrop.html', 'uib/template/modal/window.html']);
+angular.module(MODULE_NAME, ['ui.bootstrap.modal', 'uib/template/modal/window.html']);
 
 module.exports = MODULE_NAME;