Capability enum become Mail_Notification_Flags
Capability enum become Mail_Notification_Flags

The enumeration name is changed from Capability to
Mail_Notification_Flags, as Capability is too generic.
Also as this is about flags, using tp:flags instead.

Signed-off-by: Nicolas Dufresne <36c35e0aac84fcb59b447cc6415df42e7fda8df7@collabora.co.uk>

TelepathyIM/telepathy-spec,freedesktop-unofficial-mirror/telepathy__telepathy-spec