Remove insecure environment

It did not delete the empty folder anyway.

colddb.lua

@@ -1,7 +1,5 @@
 colddb = {}
 
-local ie = ...
-
 local function createDir(directory)
 	return minetest.mkdir(directory)
 end
@@ -98,13 +96,7 @@ function colddb.remove_tag(db,name)
 		local wc = delete_path:len()
 		delete_path = delete_path:sub(0,wc-1)
 		db.tags[name] = nil
-		local err,msg = os.remove(delete_path)
-		if err == nil and ie then
-			local err,msg = ie.os.remove(delete_path)
-			if err == nil and ie then
-				assert(ie, "Please add colddb to secure.trusted_mods in the settings")
-			end
-		end
+		os.remove(delete_path)
 	end
 end