cephadm: fix mistaken call to get_container_mounts_for_type

cephadm: fix mistaken call to get_container_mounts_for_type

When this function was refactored two variants were created:
get_container_mounts_for_type and _get_container_mounts_for_type.  The
latter doesn't append podman specific mounts so that it can be called
from other functions that do append podman specific mounts.
Unfortunately, I didn't call the correct function from
get_container_mounts and therefore it was redundantly doing the podman
mounts update. This corrects that error.

Signed-off-by: John Mulligan <jmulligan@redhat.com>