Hide song credit in artificial fade on menu-caused playsim start

Technically unrelated but it was annoying me, and since I modified songcredit here I can attach it as a second bullet point

src/menus/play-local-race-time-attack.c

@@ -500,6 +500,8 @@ void M_StartTimeAttack(INT32 choice)
 
 	paused = false;
 
+	S_StopMusicCredit();
+
 	// Early fadeout to let the sound finish playing
 	F_WipeStartScreen();
 	V_DrawFill(0, 0, BASEVIDWIDTH, BASEVIDHEIGHT, 31);

src/menus/transient/cup-select.c

@@ -108,6 +108,10 @@ void M_CupSelectHandler(INT32 choice)
 
 			S_StartSound(NULL, sfx_s3k63);
 
+			paused = false;
+
+			S_StopMusicCredit();
+
 			// Early fadeout to let the sound finish playing
 			F_WipeStartScreen();
 			V_DrawFill(0, 0, BASEVIDWIDTH, BASEVIDHEIGHT, 31);

src/menus/transient/level-select.c

@@ -538,6 +538,8 @@ void M_LevelSelected(INT16 add)
 
 			paused = false;
 
+			S_StopMusicCredit();
+
 			// Early fadeout to let the sound finish playing
 			F_WipeStartScreen();
 			V_DrawFill(0, 0, BASEVIDWIDTH, BASEVIDHEIGHT, 31);