bug: xplr: cfg.plugins does not work for more than one plugin

[ChanceHarrison]

Are you following the right branch?

• My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• I have searched the existing issues

Issue description

The implementation of programs.xplr.plugins does not correctly set the package.path in the Lua configuration file that gets written out.

The result is that users cannot enable/load any additional plugins after the first.

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For the full context, please reference this discussion on the upstream repository.

Maintainer CC

@NotAShelf

System information

- system: `"x86_64-linux"`
 - host os: `Linux 6.1.49, NixOS, 23.11 (Tapir), 23.11.20230830.a63a64b`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.17.0`
 - nixpkgs: `/nix/store/flsqq53kqi52lz73n543wmxz0mbhpb52-source`

[stale]

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[NotAShelf]

not stale, PR stil needs merging