Air tanks get their own sprite + reset fix

code/game/objects/items/tanks/tank_types.dm

@@ -60,7 +60,7 @@
 /obj/item/tank/internals/air
 	name = "air tank"
 	desc = "Mixed anyone?"
-	icon_state = "oxygen"
+	icon_state = "air"
 	force = 10
 	dog_fashion = /datum/dog_fashion/back
 

code/game/objects/items/tanks/tanks.dm

@@ -177,7 +177,7 @@
 		if("pressure")
 			var/pressure = params["pressure"]
 			if(pressure == "reset")
-				pressure = TANK_DEFAULT_RELEASE_PRESSURE
+				pressure = initial(distribute_pressure)
 				. = TRUE
 			else if(pressure == "min")
 				pressure = TANK_MIN_RELEASE_PRESSURE