Revert "nextcloud: use mkDefault for whole nginx config"

This breaks the Nextcloud vhost declaration when adding e.g. another
vhost as the `services.nginx.virtualHosts` option has `{ nextcloud =
...; }` as *default* value which will be replaced by another
`virtualHosts`-declaration with a higher (e.g. the default) priority.

The following cases are now supported & covered by the module:

* `nginx` is enabled with `nextcloud` enabled and other vhosts can be
  added / other options can be declared without having to care
  about the declaration's priority.

* Settings in the `nextcloud`-vhost in `nginx` have to be altered using
  `mkForce` as this is the only way how we officially support `nginx`
  for `nextcloud` and customizations have to be done explicitly using
  `mkForce`.

* `nginx` will be completely omitted if a user enables nextcloud
  and disables nginx using `services.nginx.enable = false;`. (because
  nginx will be enabled by this module using `mkDefault`).

This reverts commit 128dbb31cca3ba479396c6b65946e2e6503c0f8d.
Closes #95259

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