nixos/nextcloud: drop default for `dbtype` setting

Closes #355606

To quote the system requirements[1]:

> Database: SQLite 3.16+ (only recommended for testing and minimal-instances)

As discussed[2], this would already fail at eval-time for everyone and
makes all sqlite users aware that this is probably not the best choice.
Doing that regardless, is now an explicit decision.

[1] https://docs.nextcloud.com/server/30/admin_manual/installation/system_requirements.html
[2] https://github.com/NixOS/nixpkgs/pull/369242#discussion_r1899706512

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