fix: cheat hud in demo playback

demo playback is never used in a speedrun lol

Author: ThisAMJ

src/Features/Hud/CheatWarn.cpp

@@ -81,6 +81,7 @@ class CheatWarnHud : public Hud {
 
 	bool ShouldDraw() override {
 		if (!Hud::ShouldDraw()) return false;
+		if (engine->demoplayer->IsPlaying()) return false;
 
 		switch (sar_cheat_hud.GetInt()) {
 			case 0: