Remove default:dirt_with_grass_footsteps and add alias.

This node look almost identical to dirt with grass and didn't seem to have any use.

mods/default/aliases.lua

@@ -78,3 +78,4 @@ minetest.register_alias("default:pinewood", "default:pine_wood")
 minetest.register_alias("default:ladder", "default:ladder_wood")
 minetest.register_alias("default:sign_wall", "default:sign_wall_wood")
 
+minetest.register_alias("default:dirt_with_grass_footsteps", "default:dirt_with_grass")

mods/default/nodes.lua

@@ -293,18 +293,6 @@ minetest.register_node("default:dirt_with_grass", {
 	}),
 })
 
-minetest.register_node("default:dirt_with_grass_footsteps", {
-	description = "Dirt with Grass and Footsteps",
-	tiles = {"default_grass.png^default_footprint.png", "default_dirt.png",
-		{name = "default_dirt.png^default_grass_side.png",
-			tileable_vertical = false}},
-	groups = {crumbly = 3, soil = 1, not_in_creative_inventory = 1},
-	drop = 'default:dirt',
-	sounds = default.node_sound_dirt_defaults({
-		footstep = {name = "default_grass_footstep", gain = 0.25},
-	}),
-})
-
 minetest.register_node("default:dirt_with_dry_grass", {
 	description = "Dirt with Dry Grass",
 	tiles = {"default_dry_grass.png",