Fix messaging updating
Fix messaging updating

ComposeMessageActivity stopped updating its list of messages
when a message was sent or received.  A recent change (Ic18f0307) to not
automatically register the ContentObserver when creating the CursorAdapter
broke the messaging app. Fixed by passing in the flag to request the
ContentObserver.

Change-Id: Ic55e67d7ecd1e33f59d19755752054b430402bbd

bmaupin/android-sms-plus