gdm: delete broken .desktop files

GDM tries to run these during the login window and one of these crashes, leading to an autologin failure. Remove the non-essential ones to get rid of this problem.

The proper fix is to stop metacity crashing.

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>