split ui_crafting_form

into craft grid/trash image and a single slot image.  The latter is now
used for a refill slot if user has creative priv or server is in
creative mode.

internal.lua

@@ -32,6 +32,10 @@ function unified_inventory.get_formspec(player, page)
 		formspec = formspec .. "background[-0.19,-0.2;11.4,8.4;ui_form_bg.png]"
 	end
 
+	if unified_inventory.is_creative(player_name) and page == "craft" then
+		formspec = formspec.."background[0,"..(unified_inventory.formspec_y + 2)..";1,1;ui_single_slot.png]"
+	end
+
 	local fsdata = nil
 
 	-- Current page

register.lua

@@ -136,7 +136,7 @@ unified_inventory.register_button("clear_inv", {
 unified_inventory.register_page("craft", {
 	get_formspec = function(player, formspec)
 		local player_name = player:get_player_name()
-		local formspec = "background[0,"..unified_inventory.formspec_y..";8,3;ui_crafting_form.png]"
+		local formspec = "background[2,"..unified_inventory.formspec_y..";6,3;ui_crafting_form.png]"
 		formspec = formspec.."background[0,"..(unified_inventory.formspec_y + 3.5)..";8,4;ui_main_inventory.png]"
 		formspec = formspec.."label[0,"..unified_inventory.form_header_y..";Crafting]"
 		formspec = formspec.."listcolors[#00000000;#00000000]"