Halves the volume of the arcade game (#2853)

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## About The Pull Request
Title
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## Why It's Good For The Game
Currently you can hear people playing this game across entire ships it's
a bit ridiculous
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benefit the game. If you can't justify it in words, it might not be
worth adding. -->

## Changelog

:cl:
tweak: Finally turned down the volume of the arcade program
/🆑

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code/modules/modular_computers/file_system/programs/arcade.dm

@@ -28,7 +28,7 @@
 	usr?.mind?.adjust_experience(/datum/skill/gaming, 1)
 	if(boss_hp <= 0)
 		heads_up = "You have crushed [boss_name]! Rejoice!"
-		playsound(computer.loc, 'sound/arcade/win.ogg', 50)
+		playsound(computer.loc, 'sound/arcade/win.ogg', 25)
 		game_active = FALSE
 		program_icon_state = "arcade_off"
 		if(istype(computer))
@@ -38,7 +38,7 @@
 		sleep(10)
 	else if(player_hp <= 0 || player_mp <= 0)
 		heads_up = "You have been defeated... how will the station survive?"
-		playsound(computer.loc, 'sound/arcade/lose.ogg', 50)
+		playsound(computer.loc, 'sound/arcade/lose.ogg', 25)
 		game_active = FALSE
 		program_icon_state = "arcade_off"
 		if(istype(computer))
@@ -58,17 +58,17 @@
 		return
 	if (boss_mp <= 5)
 		heads_up = "[boss_mpamt] magic power has been stolen from you!"
-		playsound(computer.loc, 'sound/arcade/steal.ogg', 50, TRUE)
+		playsound(computer.loc, 'sound/arcade/steal.ogg', 25, TRUE)
 		player_mp -= boss_mpamt
 		boss_mp += boss_mpamt
 	else if(boss_mp > 5 && boss_hp <12)
 		heads_up = "[boss_name] heals for [bossheal] health!"
-		playsound(computer.loc, 'sound/arcade/heal.ogg', 50, TRUE)
+		playsound(computer.loc, 'sound/arcade/heal.ogg', 25, TRUE)
 		boss_hp += bossheal
 		boss_mp -= boss_mpamt
 	else
 		heads_up = "[boss_name] attacks you for [boss_attackamt] damage!"
-		playsound(computer.loc, 'sound/arcade/hit.ogg', 50, TRUE)
+		playsound(computer.loc, 'sound/arcade/hit.ogg', 25, TRUE)
 		player_hp -= boss_attackamt
 
 	pause_state = FALSE
@@ -109,7 +109,7 @@
 				attackamt = rand(2,6) + rand(0, gamerSkill)
 			pause_state = TRUE
 			heads_up = "You attack for [attackamt] damage."
-			playsound(computer.loc, 'sound/arcade/hit.ogg', 50, TRUE)
+			playsound(computer.loc, 'sound/arcade/hit.ogg', 25, TRUE)
 			boss_hp -= attackamt
 			sleep(10)
 			game_check()
@@ -126,7 +126,7 @@
 				healcost = rand(1, maxPointCost)
 			pause_state = TRUE
 			heads_up = "You heal for [healamt] damage."
-			playsound(computer.loc, 'sound/arcade/heal.ogg', 50, TRUE)
+			playsound(computer.loc, 'sound/arcade/heal.ogg', 25, TRUE)
 			player_hp += healamt
 			player_mp -= healcost
 			sleep(10)
@@ -139,7 +139,7 @@
 				rechargeamt = rand(4,7) + rand(0, gamerSkill)
 			pause_state = TRUE
 			heads_up = "You regain [rechargeamt] magic power."
-			playsound(computer.loc, 'sound/arcade/mana.ogg', 50, TRUE)
+			playsound(computer.loc, 'sound/arcade/mana.ogg', 25, TRUE)
 			player_mp += rechargeamt
 			sleep(10)
 			game_check()