Remove ignoring of non-local definitions lint

Since this is a nighly lint, it throws a warning when render is
compiled on stable. The warning isn't thrown anymore anyways.

src/bentopy/render/lib.rs

@@ -1,4 +1,4 @@
-#![allow(non_local_definitions, dead_code)]
+#![allow(dead_code)]
 
 use std::{path::PathBuf, str::FromStr};