Jukebox volume fixes (#90417)

## About The Pull Request

- Fixes jukebox volume reverting to 100% instead of preference setting
when adjusted at the jukebox.
- Fixes jukebox volume preference not applying to active jukebox music
track
- Splits jukebox and instrument into two different preferences.

## Why It's Good For The Game

The jukebox volume correctly updates and remains at what the player
sets.

## Changelog

🆑 LT3
fix: Jukebox volume preference applies to currently playing music
fix: Jukebox volume no longer resets to 100% when adjusted from the
object
/🆑

code/modules/client/preferences/sounds.dm

@@ -38,9 +38,16 @@
 	savefile_key = "sound_instruments"
 	savefile_identifier = PREFERENCE_PLAYER
 
-/datum/preference/numeric/volume/sound_instruments/apply_to_client_updated(client/client, value)
-	if (!value)
-		client.mob.stop_sound_channel(CHANNEL_JUKEBOX)
+/// Controls jukebox track volume
+/datum/preference/numeric/volume/sound_jukebox
+	category = PREFERENCE_CATEGORY_GAME_PREFERENCES
+	savefile_key = "sound_jukebox"
+	savefile_identifier = PREFERENCE_PLAYER
+
+/datum/preference/numeric/volume/sound_jukebox/apply_to_client_updated(client/client, value)
+	var/mob/client_mob = client.mob
+	if(!isnull(client_mob))
+		SEND_SIGNAL(client_mob, COMSIG_MOB_JUKEBOX_PREFERENCE_APPLIED)
 
 /datum/preference/choiced/sound_tts
 	category = PREFERENCE_CATEGORY_GAME_PREFERENCES