Adds new sprites for the kegs, adds a Himean kvass keg (#20851)

Credit to spookywastaken in Discord/spookypineapple in Byond for all the
art, with a tiny modification of the distillery by me.

![Kegs](https://github.com/user-attachments/assets/27c7fcbc-c5f5-48ec-8db6-eff83ca914ba)



- [x] Still sprites
- [x] Rice beer sprite fixed. when dey wake up. hopefully. i pray.

---------

Co-authored-by: steviii <cormallenfield123@gmail.com>

code/modules/reagents/reagent_dispenser.dm

@@ -342,7 +342,7 @@
 /obj/structure/reagent_dispensers/keg
 	name = "keg"
 	desc = "An empty keg."
-	icon_state = "beertankTEMP"
+	icon_state = "keg"
 	amount_per_transfer_from_this = 10
 
 /obj/structure/reagent_dispensers/keg/attackby(obj/item/attacking_item, mob/user)
@@ -367,10 +367,14 @@
 
 /obj/structure/reagent_dispensers/keg/beerkeg
 	name = "beer keg"
-	desc = "A beer keg"
+	desc = "A keg full of Virklunder beer, a simple brew from New Gibson."
+	icon_state = "keg_beer"
 	reagents_to_add = list(/singleton/reagent/alcohol/beer = 1000)
 
 /obj/structure/reagent_dispensers/keg/beerkeg/rice
+	name = "rice beer keg"
+	desc = "A keg full of Ebisu rice beer, a light lagered beer popular on Konyang."
+	icon_state = "keg_rice"
 	reagents_to_add = list(/singleton/reagent/alcohol/rice_beer = 1000)
 
 /obj/structure/reagent_dispensers/keg/xuizikeg
@@ -379,6 +383,12 @@
 	icon_state = "keg_xuizi"
 	reagents_to_add = list(/singleton/reagent/alcohol/butanol/xuizijuice = 1000)
 
+/obj/structure/reagent_dispensers/keg/kvass
+	name = "\improper Dorshafen kvass keg"
+	desc = "A keg full of Dorshafen Deluxe kvass, a fermented non-alcoholic mushroom drink. It is a common sight across workers homes in Himeo, and even abroad."
+	icon_state = "keg_kvass"
+	reagents_to_add = list(/singleton/reagent/drink/mushroom_kvass = 1000)
+
 /obj/structure/reagent_dispensers/keg/mead
 	name = "mead barrel"
 	desc = "A wooden mead barrel."