mod_admin_blocklist: Add config option for which role(s) to consider (0.12+) Fixes that in trunk, a "prosody:operator" (formerly a global admin) is not considered a "prosody:admin", so those were not included in the set.

This module discards typing notifications sent to a bare host JID,
preventing error replies to be sent. These errors are harmless but can
be annoying sometimes if your client shows them prominently.