Bluetooth: Mesh: Link Close without success should fail NPPI procedure

When we receive `RPR_OP_LINK_CLOSE` message with reason other than
`SUCCESS` we should fail NPPI refresh procedure, not complete it.
Dropping `COMPLETE` flag will result in calling `reprovision_fail`
in `prov_link_closed`, not `reprovision_complete`.

Signed-off-by: Krzysztof Kopyściński <krzysztof.kopyscinski@codecoup.pl>