Remove physics thread getting the gl context

servers/physics_2d/physics_2d_server_wrap_mt.cpp

@@ -54,8 +54,6 @@ void Physics2DServerWrapMT::thread_loop() {
 
 	server_thread = Thread::get_caller_id();
 
-	OS::get_singleton()->make_rendering_thread();
-
 	physics_2d_server->init();
 
 	exit = false;