patch-ppd-files: use `meta` and `passthru` directly
When I authored the nix file in
335a9083b02d2a7034dd98c8641f019e85e50426,
`makeSetupHook` didn't know about `passthru` or `meta`.
So I foisted these attributes on the
derivation with `.overrideAttrs`.
Commits ba895a7da8f86c6f924fc96026d8f1cb1ea2af1e and
48034046bf6271d44f7dea4c1ba97196b3b105a7 enabled
`makeSetupHook` to receive these attributes directly.
It seems advisable to use that instead of `.overrideAttrs`.