unbound service: use auto-generated uid

1. The preStart script ensures consistent ownership, even if the unbound
   user's uid has changed
2. The unbound daemon does not generate data that needs to be private to
   it, so it would not matter that a different service would end up
   owning its data (as long as unbound remains enabled, it should reclaim
   ownership soon enough anyway).

Thus, there's no clear benefit to allocate a dedicated uid for the
unbound service.  This releases uid/gid 48.

Also, because the preStart script creates the data directory, there's no
need to specify a homedir or ask for its creation.

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