restrict food tray pickup items to food, fix sliceable tray click pickup (#29216)

code/game/objects/items/weapons/storage/bags.dm

@@ -361,7 +361,11 @@
 	flags = CONDUCT
 	slot_flags = null
 	materials = list(MAT_METAL=3000)
-	cant_hold = list(/obj/item/disk/nuclear) // Prevents some cheesing
+	can_hold = list(
+		/obj/item/food,
+		/obj/item/reagent_containers/drinks,
+		/obj/item/reagent_containers/condiment,
+	)
 
 /obj/item/storage/bag/tray/attack__legacy__attackchain(mob/living/M, mob/living/user)
 	..()

code/modules/food_and_drinks/food_base.dm

@@ -330,7 +330,7 @@
 		if(istype(I, /obj/item/kitchen/knife) || istype(I, /obj/item/scalpel))
 			inaccurate = FALSE
 	else
-		return TRUE
+		return ..()
 	if(!isturf(loc) || !(locate(/obj/structure/table) in loc) && \
 			!(locate(/obj/machinery/optable) in loc) && !(locate(/obj/item/storage/bag/tray) in loc))
 		to_chat(user, "<span class='warning'>You cannot slice [src] here! You need a table or at least a tray to do it.</span>")