fix(xo-web/backup-ng/new): fix empty `srs` & `remotes`
fix(xo-web/backup-ng/new): fix empty `srs` & `remotes`

Send `undefined` instead of `false`.

lmcro/xo-web,lmcro/xo-web,vatesfr/xo-web,vatesfr/xo-web,lmcro/xo-web