Update EFO to appendectomy via backend - GCST007595

[earlEBI]

By user request, please update the trait and EFO for study 'GCST007595'.

Reported trait should be: Appendectomy EFO trait should be: Appendectomy EFO_0600086

This should be done via the backend because this publication was originally curated through the Curation App and I cannot easily edit / re-curate.