Get rid of the image button left of the crafting guide

It had the same function as clicking the craft result on the
right (just inverted), making it redundant. Click either one more
than once and UI would alternately show usages or recipes.

register.lua

@@ -342,9 +342,7 @@ ui.register_page("craftguide", {
 		else
 			formspec[n] = stack_image_button(craftguideresultx, craftguidey, 1.2, 1.2,
 					"item_button_" .. rdir .. "_", ItemStack(craft.output))
-			formspec[n+1] = stack_image_button(craftguidex-2.3, craftguidey, 1.2, 1.2,
-					"item_button_usage_", ItemStack(item_name))
-			n = n + 2
+			n = n + 1
 		end
 
 		local craft_type = ui.registered_craft_types[craft.type] or