nixos/podman: use given package for dockerCompat

Defining a package that isn't the default results in podman-compat linking to a different version of podman (always the default one). This PR changes the behavior so that the given alternative package is used for the dockerCompat option as well. This could technically break things for people who rely on this quirk, albeit the previous behavior is probably not what one would expect.

Co-authored-by: Winter <winter@winter.cafe>

nixos/modules/virtualisation/podman/default.nix

@@ -5,7 +5,7 @@ let
 
   inherit (lib) mkOption types;
 
-  podmanPackage = (pkgs.podman.override {
+  podmanPackage = (cfg.package.override {
     extraPackages = cfg.extraPackages
       # setuid shadow
       ++ [ "/run/wrappers" ]