Remove McdPendingChannel structure
Remove McdPendingChannel structure

There is no need for this structure to exist. The McdChannel already has that
information, so let's just use it instead.
Code gets simplified a bit.

freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control