tox: fix a typo
tox: fix a typo

the line setting `ANSIBLE_CONFIG` obviously contains a typo introduced
by 1e283bf69be8b9efbc1a7a873d91212ad57c7351

`ANSIBLE_CONFIG` has to point to a path only (path to an ansible.cfg)

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

fgal/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible