[MIRROR] Lobby music won't be the same as the last round (#2727)

* Merge pull request #30636 from Cyberboss/NoDupeMusic

Lobby music won't be the same as the last round

* Lobby music won't be the same as the last round

code/controllers/subsystem/ticker.dm

@@ -69,6 +69,9 @@ SUBSYSTEM_DEF(ticker)
 /datum/controller/subsystem/ticker/Initialize(timeofday)
 	load_mode()
 	var/list/music = world.file2list(ROUND_START_MUSIC_LIST, "\n")
+	var/old_login_music = trim(file2text("data/last_round_lobby_music.txt"))
+	if(music.len > 1)
+		music -= old_login_music
 	login_music = pick(music)
 
 	if(!GLOB.syndicate_code_phrase)
@@ -856,3 +859,4 @@ SUBSYSTEM_DEF(ticker)
 		)
 
 	SEND_SOUND(world, sound(round_end_sound))
+	text2file(login_music, "data/last_round_lobby_music.txt")