fix(sidenav): Notify other close events like datepicker-close too

md-datepicker won't close if sidebar is open and the sidebar event stops propagation

Fixes #5522. Closes #5528.

src/components/sidenav/sidenav.js

@@ -375,7 +375,6 @@ function SidenavDirective($mdMedia, $mdUtil, $mdConstant, $mdTheming, $animate,
      */
     function close(ev) {
       ev.preventDefault();
-      ev.stopPropagation();
 
       return sidenavCtrl.close();
     }