common-ostree: Remove redundant entry for toolbox

Toolbx was added to the default Fedora Workstation installation for
Fedora 37 [1].  Therefore, it already gets pulled in through
fedora-common-ostree-pkgs.yaml.

[1] fedora-comps commit cdbc1f4ee0f28684
    https://pagure.io/fedora-comps/c/cdbc1f4ee0f28684
    https://pagure.io/fedora-workstation/issue/320

https://pagure.io/workstation-ostree-config/pull-request/420

fedora-common-ostree.yaml

@@ -30,7 +30,6 @@ packages:
   - buildah
   - podman
   - skopeo
-  - toolbox
   # Provides terminal tools like clear, reset, tput, and tset
   - ncurses
   # Flatpak support