Revert "CI: test nftables driver on fedora"

This reverts commit 43f6173.

The netavark version with nftables default is in f41 and rawhide
already so this is no longer needed. While we do not yet test f41 in CI
we have rawhide which is good enough until we update.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

contrib/cirrus/setup_environment.sh

@@ -147,11 +147,6 @@ case "$OS_RELEASE_ID" in
             msg "Enabling container_manage_cgroup"
             showrun setsebool container_manage_cgroup true
         fi
-
-        # Test nftables driver, https://fedoraproject.org/wiki/Changes/NetavarkNftablesDefault
-        # We can drop this once this implemented and pushed into fedora stable. We cannot test it on
-        # debian because the netavark version there is way to old for nftables support.
-        printf "[network]\nfirewall_driver=\"nftables\"\n" > /etc/containers/containers.conf.d/90-nftables.conf
         ;;
     *) die_unknown OS_RELEASE_ID
 esac