nemo-dnd.c: Fix the drop action menu in Wayland.

This menu also popped up with no transient parent. Use our menu
helper from 4a41953.

Also disconnect its deactivate signal before unreffing it when
done.

Author: mtwebster

libnemo-private/nemo-dnd.c

@@ -924,19 +924,19 @@ nemo_drag_drop_action_ask (GtkWidget *widget,
 			  &damd);
 
 	gtk_grab_add (menu);
-	
-	gtk_menu_popup (GTK_MENU (menu), NULL, NULL,
-			NULL, NULL, 0, GDK_CURRENT_TIME);
-	
+
+	eel_pop_up_menu_at_pointer (GTK_MENU (menu), NULL, widget);
+
 	g_main_loop_run (damd.loop);
 
 	gtk_grab_remove (menu);
-	
-	g_main_loop_unref (damd.loop);
+	g_signal_handlers_disconnect_by_data (menu, &damd);
 
 	g_object_ref_sink (menu);
 	g_object_unref (menu);
 
+	g_main_loop_unref (damd.loop);
+
 	return damd.chosen;
 }