Make moreores' copper rail connect again, add metal sounds

functions.lua

@@ -217,7 +217,8 @@ function boost_cart:register_rail(name, def_overwrite)
 		selection_box = {
 			type = "fixed",
 			fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
-		}
+		},
+		sounds = default.node_sound_metal_defaults()
 	}
 	for k, v in pairs(def_overwrite) do
 		def[k] = v

rails.lua

@@ -18,6 +18,15 @@ boost_cart:register_rail(":"..regular_rail_itemname, {
 -- Moreores' copper rail
 if minetest.get_modpath("moreores") then
 	minetest.register_alias("carts:copperrail", "moreores:copper_rail")
+
+	if minetest.raillike_group then
+		-- Ensure that this rail uses the same connect_to_raillike
+		local new_groups = minetest.registered_nodes["moreores:copper_rail"].groups
+		new_groups.connect_to_raillike = minetest.raillike_group("rail")
+		minetest.override_item("moreores:copper_rail", {
+			groups = new_groups
+		})
+	end
 else
 	boost_cart:register_rail(":carts:copperrail", {
 		description = "Copper rail",