Codechange: [Win32] use CSleep() instead of Sleep() like everywhere else

Functional it is identical. Just helps future-us when searching
for sleeps.

src/video/win32_v.cpp

@@ -1241,7 +1241,7 @@ void VideoDriver_Win32::MainLoop()
 
 			/* Release the thread while sleeping */
 			if (_draw_threaded) draw_lock.unlock();
-			Sleep(1);
+			CSleep(1);
 			if (_draw_threaded) draw_lock.lock();
 
 			NetworkDrawChatMessage();