[FIX] Kitchen machines no longer accept reagents while running (#27288)

* Cannot add reagents to an machine that is on

* Check if target is refillable, not if it's drainable

---------

Co-authored-by: Adrer <adrermail@gmail.com>

code/modules/food_and_drinks/food/condiment.dm

@@ -86,7 +86,7 @@
 		to_chat(user, "<span class='notice'>You fill [src] with [trans] units of the contents of [target].</span>")
 
 	//Something like a glass or a food item. Player probably wants to transfer TO it.
-	else if(target.is_drainable() || istype(target, /obj/item/food))
+	else if(target.is_refillable() || istype(target, /obj/item/food))
 		if(!reagents.total_volume)
 			to_chat(user, "<span class='warning'>[src] is empty!</span>")
 			return

code/modules/food_and_drinks/kitchen_machinery/kitchen_machine.dm

@@ -197,6 +197,14 @@
 /obj/machinery/kitchen_machine/proc/special_attack_shove(mob/living/target, mob/living/attacker)
 	return FALSE
 
+/**
+ * Check if the machine is running when trying to add reagents to it.
+ */
+/obj/machinery/kitchen_machine/is_refillable()
+	if(operating)
+		return FALSE
+	. = ..()
+
 /********************
 *   Machine Menu	*
 ********************/