gmod_src: Fixed the render target getting stuck on a RT that..

Revision 861
Fixed the render target getting stuck on a RT that isn’t the backbuffer… if a Lua coder didn’t set it back to the old oneChanged Files:
[ul]
[li]trunk/src_garrysmod/game/client/cdll_client_int.cpp[/li][/ul]
Committed By Garry Newman