Add code to correct content of AF_DOMAINLIST_IDS / AF_CHAINLIST_IDS

[sillitoe]

The script create-dataset-cath-files currently uses placeholders for af2_domainlist_ids and af2_chainlist_ids output file:

cath-af-cli create-dataset-cath-files \
    --csv_uniprot_ids dataset10k.uniprot_ids.csv \
    --csv_uniprot_md5 dataset10k.uniprot_md5.csv \
    --gene3d_crh_output dataset10k.gene3d_crh_output \
    --af2_domainlist_ids dataset10k.af2_domainlist_ids.csv \
    --af2_chainlist_ids dataset10k.af2_chainlist_ids.csv \
    --af2_cath_annotations dataset10k.af2_cath_annotations.csv
    --dbname gene3d_21

[sillitoe]

Need to check that we still need af2_chainlist_ids (possibly don't as we are removing SETH chains task)