users: a user can't remove its own last key

A user managing its own keys (1168) could remove the last, and then
neither sign nor log in by key. It can't now: DELETE /auth/keys/{id}
of the last answers 409, the rules take a user's change of its own keys
only with one left after it, and under a strict policy its own entry
signed only with one key at least. One who may manage users still may.

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