Mms: Fix MMS notification isn't disappeared.

From notification launched message detail, mms didn't
update the 'seen' field in database for message,
It caused message's notification cann't disappear.

Add update 'seen' field from 0 to 1 operation
in message detail's onCreate().

CRs-Fixed: 755385

Change-Id: I2c0554cba9ef3dcaefc7ce72fcdb0e67d99c4796