[next] PresenceSpec default type should be Unset instead of Unknown

Submitted by James Smith

Assigned to Telepathy bugs list

Link to original bug (#91671)

Description

Created attachment 117749 Implement unset connection presence type in Tp::PresenceSpec.

We use this in a few places, and have to manually create the presence. This patch makes it simpler to create such presences.

Attachment 117749, "Implement unset connection presence type in Tp::PresenceSpec.":
file_91671.txt