[Settings] Avoid popup activity get bringup from recent history

A popup dialog is designed to sit on top of an single instance activity.
Although activity might #finish(), but will be restarted due to staying
in the recent history.

Remove it from recent history may allow end user not seeing that UI.

Bug: 202033230
Test: local
Change-Id: Id1d52eefb90d011296495f39b1533a1af68435f1
(cherry picked from commit f81eaeb8)