Show predefined title and description in finished notification

shareTitle and shareDescription is passed by the caller of the
bugreport. Show these in the finished bugreport notification.

Pre-set shareTitle takes precedence over user modified title.

shareDescription and description are not related/dependant on each other
in any way.

Bug: 150333444
Test: Manual (by passing EXTRA_TITLE and EXTRA_DESCRIPTION from
ActivityManagerService when trigerring a bugreport)

Change-Id: I2bfd080aeee677cdc8d0af339d7ad4a29451c3e0