FiooFix invalid int type hint for multipart part ids
FiooFix invalid int type hint for multipart part ids

Fixes https://github.com/nextcloud/mail/issues/1391

Signed-off-by: Christoph Wurst <7abde52c298496fa169fb750f91f213a282142af@winzerhof-wurst.at>

ChristophWurst/mail,kingjan1999/mail,kingjan1999/mail,ChristophWurst/mail,ChristophWurst/mail,kingjan1999/mail