Fix CURL cert file path override for REST (#1452)
Fix CURL cert file path override for REST (#1452)

GlobalState::cert_file is a single-file cert store, which corresponds
to CURLOPT_CAINFO. CURLOPT_CAPATH expects a directory.
TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB