we already had desertgravel - drop the obsolet node, update texture for old node, add alias

nodes.lua

@@ -1,6 +1,6 @@
 minetest.register_node("illuna:desert_gravel", {
 	description = "Gravel",
-	tiles = {"desert_gravel.png"},
+	tiles = {"illuna_desertgravel.png"},
 	groups = {crumbly = 2, falling_node = 1},
 	    sounds = default.node_sound_dirt_defaults({
         footstep = {name="default_gravel_footstep", gain=0.5},
@@ -15,6 +15,8 @@ minetest.register_node("illuna:desert_gravel", {
 	}
 })
 
+minetest.register_alias("illuna:desertgravel", "illuna:desert_gravel")
+
 minetest.register_node("illuna:stonebrick", {
 	description = "Stone Brick",
 	paramtype2 = "facedir",
@@ -35,14 +37,6 @@ minetest.register_node("illuna:moonbrick", {
     sounds = default.node_sound_stone_defaults(),
 })
 
-minetest.register_node("illuna:desertgravel", {
-    description = "Desert Gravel",
-    paramtype2 = "facedir",
-    tiles = {"illuna_desertgravel.png"},
-    groups = {cracky = 2},
-    sounds = default.node_sound_stone_defaults(),
-})
-    
 function illuna.teamconstruct(pos)
     minetest.add_entity({x=pos.x, y=pos.y+1.35, z=pos.z}, "illuna:teamlist")
     local timer = minetest.get_node_timer(pos)