Remove cave ice from creative inventory

mods/default/nodes.lua

@@ -627,7 +627,8 @@ minetest.register_node("default:cave_ice", {
 	description = "Cave Ice",
 	tiles = {"default_ice.png"},
 	paramtype = "light",
-	groups = {cracky = 3, puts_out_fire = 1, cools_lava = 1, slippery = 3},
+	groups = {cracky = 3, puts_out_fire = 1, cools_lava = 1, slippery = 3,
+		not_in_creative_inventory = 1},
 	drop = "default:ice",
 	sounds = default.node_sound_glass_defaults(),
 })