nixos/nextcloud: fix `nginx`-config for Nextcloud 19 and older

It seems as I misconfigured `nginx` for certain cases such as the
`ldap`-plugin[1] in 42f6244899d1ef8839c6e0c0a9340e1334d40264. This patch
fixes the `nginx`-config to match the upstream recommendations[2].

Also added a comment to the module to remind myself to ensure that
`nginx` will work with both v19 and v20 as soon as the latter is
released and can be packaged in `nixpkgs`.

Co-authored-by: nivadis <nivadis@users.noreply.github.com>

[1] https://github.com/nextcloud/server/issues/16194#issuecomment-688839888
[2] https://docs.nextcloud.com/server/19/admin_manual/installation/nginx.html

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