The Nextcloud admin guide says that output buffering must be turned off
or otherwise PHP will return memory-related errors [1]. As the default
value for this PHP setting is 4096 and thus enabled the Nextcloud setup
is thus misconfigured by default. This misconfiguration will be shown in
the "Security & setup warnings" dialog for the administrator.
Fix this misconfiguration by setting "output_buffering=0" by default.
[1]: https://docs.nextcloud.com/server/stable/admin_manual/configuration_files/big_file_upload_configuration.html#configuring-php
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