Updated dbupdate scripts so they will no longer fail when there are multiple users with the same e-mail #1445
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In some edge cases there may be more than one user returned when executing:
SELECT ezuser.contentobject_id FROM ezuser WHERE ezuser.email = ezgeneral_digest_user_settings.address
which result in migration script failing with error:ERROR 1242 (21000): Subquery returns more than 1 row
This PR fixes this, limiting the query to return a single row.