Remove forced delay from display::draw();

this was causing "double" delays, and isn't the proper spot for
delaying anyway.

src/display.cpp

@@ -901,10 +901,6 @@ void display::draw(bool update,bool force)
 	const int current_time = SDL_GetTicks();
 	const int wait_time = lastDraw_ + time_between_draws - current_time;
 
-	//force a wait for 10 ms every frame.
-	//TODO: review whether this is the correct thing to do
-	delay(maximum<int>(10,wait_time));
-
 	if(update) {
 		lastDraw_ = SDL_GetTicks();