connectivity-monitor: start watching 'use-conn' key in constructed
connectivity-monitor: start watching 'use-conn' key in constructed

We have to wait for the default GObject properties to be set before calling
g_settings_bind(). If we don't, they override the value fetched from
GSettings.

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