Nyancat: Fix texture names

mods/nyancat/README.txt

@@ -23,7 +23,7 @@ Everything not listed in here:
 Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
 
 VanessaE (WTFPL):
-  default_nc_back.png
-  default_nc_front.png
-  default_nc_rb.png
-  default_nc_side.png
+  nyancat_front.png
+  nyancat_back.png
+  nyancat_side.png
+  nyancat_rainbow.png

mods/nyancat/init.lua

 minetest.register_node("nyancat:nyancat", {
 	description = "Nyan Cat",
-	tiles = {"default_nc_side.png", "default_nc_side.png", "default_nc_side.png",
-		"default_nc_side.png", "default_nc_back.png", "default_nc_front.png"},
+	tiles = {"nyancat_side.png", "nyancat_side.png", "nyancat_side.png",
+		"nyancat_side.png", "nyancat_back.png", "nyancat_front.png"},
 	paramtype2 = "facedir",
 	groups = {cracky = 2},
 	is_ground_content = false,
@@ -12,8 +12,9 @@ minetest.register_node("nyancat:nyancat", {
 minetest.register_node("nyancat:nyancat_rainbow", {
 	description = "Nyan Cat Rainbow",
 	tiles = {
-		"default_nc_rb.png^[transformR90", "default_nc_rb.png^[transformR90",
-		"default_nc_rb.png", "default_nc_rb.png"
+		"nyancat_rainbow.png^[transformR90",
+		"nyancat_rainbow.png^[transformR90",
+		"nyancat_rainbow.png"
 	},
 	paramtype2 = "facedir",
 	groups = {cracky = 2},