Fix allow_metadata_inventory_put item count check (#34)

Currently, hoppers check the `allow_metadata_inventory_put` function, but they check whether they can insert *at least zero* items, meaning that they insert things even when they're not supposed to. This one-character change fixes that.

Author: ThePython10110

utility.lua

@@ -193,7 +193,7 @@ local function send_item_to_inv(hopper_inv, target_pos, filtered_items, placer,
 
 	local stack_to_put = stack:take_item(1)
 	if target_def.allow_metadata_inventory_put and placer -- backwards compatibility, older versions of this mod didn't record who placed the hopper
-			and target_def.allow_metadata_inventory_put(target_pos, target_inv_name, stack_num, stack_to_put, placer) < 0 then
+			and target_def.allow_metadata_inventory_put(target_pos, target_inv_name, stack_num, stack_to_put, placer) <= 0 then
 		return false
 	end