Turns down the whistle volume (again) (#75087)

## About The Pull Request Why It's Good For The Game
From a poll conducted on what sounds need balancing. It was nerfed a
year ago (happy anniversary!) in #66452, but it's still pretty loud
today.


https://user-images.githubusercontent.com/66640614/235417665-042d4b49-258e-47fd-89ad-aba5d354b820.mp4

## Changelog
🆑 Tattle
sound: nerfed the police whistle volume
/🆑

Co-authored-by: tattle <article.disaster@gmail.com>

code/modules/clothing/masks/hailer.dm

@@ -199,7 +199,7 @@ GLOBAL_LIST_INIT(hailer_phrases, list(
 		return
 	COOLDOWN_START(src, whistle_cooldown, 10 SECONDS)
 	user.audible_message("<font color='red' size='5'><b>HALT!</b></font>")
-	playsound(src, 'sound/misc/whistle.ogg', 75, FALSE, 4)
+	playsound(src, 'sound/misc/whistle.ogg', 50, FALSE, 4)
 
 /datum/action/item_action/halt
 	name = "HALT!"
@@ -214,7 +214,7 @@ GLOBAL_LIST_INIT(hailer_phrases, list(
 	COOLDOWN_DECLARE(horn_cooldown)
 
 /obj/item/clothing/mask/party_horn/ui_action_click(mob/user, action)
-	if(!COOLDOWN_FINISHED(src, horn_cooldown))	
+	if(!COOLDOWN_FINISHED(src, horn_cooldown))
 		return
 	COOLDOWN_START(src, horn_cooldown, 10 SECONDS)
 	playsound(src, 'sound/items/party_horn.ogg', 75, FALSE)