Accounts with shared-album zones (named CMM-*) returned these zones in
the photos changes/database listing alongside the real photo
libraries. rclone treated them as libraries and queried their albums,
but these zones have no CPLAlbumByPositionLive index so the query
failed with BAD_REQUEST / "Index has invalid data", aborting the whole
listing.
Only PrimarySync and SharedSync-* zones are photo libraries, so skip
any other zone during discovery.
See: https://forum.rclone.org/t/sync-to-icloud-gives-index-has-invalid-data-errors/53852
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