Normalize accounts that were closed manually

#2412 implemented account closing differently than the `deactivate` script that was being run manually before: we don't rename the participant by prefixing `deactivated-` anymore, and we clear personal information. This PR updates the DB to make it as if the deactivated accounts had been closed using the new method.
@seanlinsley Yes, we want to clear personal information, like the new account closing process does.