Mute irrelevant errors in uwsgi

Ghost User
2019-10-24T19:16:48+02:00

[We have about 2.4k write errors (`OSError`s)](https://sentry.io/organizations/thalia/issues/1048521635/?project=1463433)

These settings ignore those errors [Source](https://stackoverflow.com/questions/36156887/uwsgi-raises-oserror-write-error-during-large-request)