refactor(tvix/glue/known_paths): use StorePath

Passing a StorePathRef is annoying if we only (already) have a
StorePath.

Change-Id: Ic3b36c0041707230515a6745a57f0d25b2bafd16
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10948
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: Peter Kolloch <info@eigenvalue.net>

tvix/glue/src/builtins/derivation.rs

@@ -443,7 +443,7 @@ pub(crate) mod derivation_builtins {
         // This one is still intermediate (so not added to known_paths)
         let derivation_or_fod_hash_tmp = drv.derivation_or_fod_hash(|drv_path| {
             known_paths
-                .get_hash_derivation_modulo(drv_path)
+                .get_hash_derivation_modulo(&drv_path.to_owned())
                 .unwrap_or_else(|| panic!("{} not found", drv_path))
                 .to_owned()
         });