ci: update commit message for Firefox addons update job

Author: foo-dogsquared

.github/workflows/update-firefox-addons.yml

@@ -24,5 +24,5 @@ jobs:
         run: nix develop --impure -c mozilla-addons-to-nix pkgs/firefox-addons/firefox-addons.json pkgs/firefox-addons/default.nix
       - uses: stefanzweifel/git-auto-commit-action@v5
         with:
-          commit_message: "firefox-addons: update as of ${{ steps.metadata.outputs.DATE }}"
+          commit_message: "pkgs/firefox-addons: update as of ${{ steps.metadata.outputs.DATE }}"
           file_pattern: pkgs/firefox-addons/