Mms: fix outgoing call handling on SMS notification

The old code generates ACTION_CALL intents with content uris instead of tel
ones, and this causes the SipCallOptionHandler not to be triggered, forcing
the call to be routed via the mobile network instead of following the user
configuration and potentially asking if SIP should be used.

Old intent:
    D/CallController( 1204): placeCall()...  intent = Intent { act=android.intent.action.CALL dat=content://com.android.contacts/data/phones/12345 (has extras) }

New intent:
    D/CallController( 1204): placeCall()...  intent = Intent { act=android.intent.action.CALL dat=tel:xxxxxxxxxxx-xxxx (has extras) }

Change-Id: Iba0134af51edb092913636ba9f51a6a344acb436