[FIX] note:open calendar when clicking on the icon

Since commit `a3d98dae` the calendar is
no longer opening when clicking on the calendar icon in the activities when
adding a note.

addons/note/static/src/js/systray_activity_menu.js

@@ -120,7 +120,7 @@ ActivityMenu.include({
     _onNoteDateTimeSetClick: function (ev) {
         ev.preventDefault();
         ev.stopPropagation();
-        this.noteDateTimeWidget.$input.select();
+        this.noteDateTimeWidget.$input.click();
     },
     /**
      * Saving note (quick create) and updating activity preview