xdg-desktop-portal-phosh: drop incorrect `updateScript`

The update script fails to eval:

    $ nix-shell maintainers/scripts/update.nix --argstr package xdg-desktop-portal-phosh
    error:
       … while calling the 'derivationStrict' builtin
         at «nix-internal»/derivation-internal.nix:37:12:
           36|
           37|   strict = derivationStrict drvAttrs;
             |            ^
           38|

       … while evaluating derivation 'nixpkgs-update-script'
         whose name attribute is located at pkgs/stdenv/generic/make-derivation.nix:544:13

       … while evaluating attribute 'shellHook' of derivation 'nixpkgs-update-script'
         at maintainers/scripts/update.nix:275:3:
          274|   '';
          275|   shellHook = ''
             |   ^
          276|     unset shellHook # do not contaminate nested shells

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'updateScript' missing
       at pkgs/by-name/xd/xdg-desktop-portal-phosh/package.nix:76:20:
           75|   passthru = {
           76|     updateScript = lib.updateScript { };
             |                    ^
           77|   };

0 files changed, 0 insertions, 0 deletions