Windows: Fixed not removing the always added hint callback on quit.

This was no real problem because SDL_Quit() also calls SDL_ClearHints().

src/timer/windows/SDL_systimer.c

@@ -107,10 +107,8 @@ SDL_TicksInit(void)
 void
 SDL_TicksQuit(void)
 {
-    if (!hires_timer_available) {
     SDL_DelHintCallback(SDL_HINT_TIMER_RESOLUTION,
                         SDL_TimerResolutionChanged, NULL);
-    }
 
     SDL_SetSystemTimerResolution(0);  /* always release our timer resolution request. */