Change settings observer for other processes to not pass a userhandle.

This is a direct cherry pick from internal with no changes: https://googleplex-android-review.git.corp.google.com/c/platform/frameworks/base/+/14426680

Bug: 180584913
Test: Not a functionality change
Change-Id: Ibf0442f9de45694e33131c0ac327d840eea8fbfe
Merged-In: Ibf0442f9de45694e33131c0ac327d840eea8fbfe