Fixed issue 4141.(key press beeping) Initializing the video backend in the GUI thread seemed to be the cause for whatever reason. Hopefully other platforms don't hate this change.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7425 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoDX11/Src/main.cpp

@@ -231,7 +231,6 @@ void VideoBackend::Shutdown()
 		delete g_renderer;
 		g_renderer = NULL;
 	}
-	EmuWindow::Close();
 }
 
 }