mod_client_management: Use grant id from key This is a minor tweak - it's faster and preserves compatibility with older data formats (that we don't necessarily want to be compatible with, but some of us have messy data stores and it pays to be a little more robust).

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.