Mms: Fix Send button is gray when insert ring tone and then input number.

Because remove recipient change listener on activity pause, but add
it on activity start that don't be called after add ring tone.

Change adding recipient change listener to activity resume.

CRs-Fixed: 740954

Change-Id: I712836044ba22263d4a77c4d498e053fa6dab18a
MMS: Fix Invalid recipient draft is still on after discard it

Due to recipients have not yet become span before back to home screen,
recipients watcher will be called when launch message second time. The
"thread id" is changed to "0" by syncing working recipients, which lead
to discard draft failed.

Change adding recipients watcher to the position that have loaded
recipients from draft.

CRs-Fixed: 708163

Change-Id: I43e8681c693bed9f7cba5bba9ca30eb956cc96a4
Mms: Fix SMS/MMS draft's phone number can't be changed.

Because initialize recipient editor after activity resume when edit
draft, so don't add recipient changed listener in activity resume.

Add recipient changed listener after query complete for editing draft.

CRs-Fixed: 741024

Change-Id: I630adc26878fdd16f66cd170f289c65766c47255