gmod_game: Fixed notification.lua being blocked by SE

Revision 890
Fixed notification.lua being blocked by SEChanged Files:
[ul]
[li]trunk/cfg/nosend.txt[/li][/ul]
Committed By Garry Newman

notifications.lua should also be in bootstrap.txt, see my explanation here

http://www.facepunch.com/threads/986675-Niggles?p=28396023&viewfull=1#post28396023