block_timings from sdp are never used if sdp is a zip archive

[vasdommes]

exists(sdp_block_timings_path) will always return false if sdp_path is a zip file (not a directory): https://github.com/davidsd/sdpb/blob/3019fcd7122794ddb9618de1adcd1d8439716031/src/sdp_solve/Block_Info/read_block_costs.cxx#L13-L14