rar5: return ARCHIVE_FAILED (not ARCHIVE_FATAL) for per-entry data errors

rar5: return ARCHIVE_FAILED (not ARCHIVE_FATAL) for per-entry data errors

Two per-entry errors in the RAR5 data-reading path were returning
ARCHIVE_FATAL, preventing iteration over subsequent entries:

- "Reading encrypted data is not currently supported": the encryption
  is per-entry; unencrypted entries in the same archive remain readable.

- "Invalid filter encountered": a malformed filter spec in one entry
  does not make the rest of the archive unreadable.

Change both to ARCHIVE_FAILED.