Fix 'reference to undefined property "_delegate"' warning
Fix 'reference to undefined property "_delegate"' warning

Set _delegate (used for DnD) even though we do not enable DnD, this fixes
a couple of 'reference to undefined property "_delegate"' warnings getting
logged.

Signed-off-by: Hans de Goede <9fa1be1a5b5729e4c6b404f34c9ce49ff4882fd8@redhat.com>

oleid/gnome-shell-teatime,oleid/gnome-shell-teatime