Mms: The screen will go to message screen

In current source, have not check exist locked message.
All case is invoke finish() function.
So it will go to message list screen.

After invoke  finish() function, I will check locked message.
If have exist locked message, i don't invoke finish() function.

CRs-Fixed: BZ1565

Change-Id: I210ae9879bc447745da63885c247c98ed5c76e48