Fix crash from reporting per-user assist data with swipe up

- In P, we would report the assist data directly to Launcher app which
  would then delegate it to AiAi.  Starting in Q, we have a per-user bound
  service to AiAi for content capture, so we should report the assist data
  for each user.  ag/5523112 incorrectly assumed that we would delegate
  this for the primary user's service.

Bug: 121130875
Test: Repeat a couple times: Launch a work profile app, hit home
Change-Id: I5d58fc4925f0f344045cb41f9c8fd6fbc5472893