Give extras bundle to showSessionForActiveService

This used to be the case before ag/7316738, where the pae.extras
got lost.
launchAssistIntet doesn't set an AssistDataReceiver, which causes
the sendBundle to be null, thus losing the information in pae.extras.

This CL puts the pae.extras back on the assistant launch path.

Fixes: 155180261

Test: m && flash && check that hold-to-talk receives mic input
      OR check that voiceInteractionSession.onShow has args != null
Change-Id: I9b2d9f1da12576b477b94c71172f7de48c67d080