Merge branch 'title-credit-attract' into 'master'

Show titlescreen music credit when a title demo is loaded

See merge request KartKrew/Kart!2083

src/p_setup.cpp

@@ -8846,6 +8846,11 @@ void P_PostLoadLevel(void)
 		G_BeginRecording(); // I AM NOW READY TO RECORD.
 	demo.deferstart = true;
 
+	if (demo.attract == DEMO_ATTRACT_TITLE)
+	{
+		S_ShowMusicCredit();
+	}
+
 	nextmapoverride = 0;
 	skipstats = 0;