Update PendingIntent target for multi-user

PendingIntents with the USER_CURRENT flag assume the current user to be
the current foreground user. This isn't always true in multi-user
configuration where a background user could be the one interacting with
a notification for example.

Bug: 262626270
Bug: 232263398
Test: adb -s logcat -D -b events | grep 'I am_intent_sender_redirect_user'
CTS-coverage-bug: 266150463
Change-Id: I5cbfa2014ee0c119ca3da42638612e4d9cf2f4c6