Add missing check of avoidMoveToFront when starting activity

Otherwise if the task is still moved to top unexpectedly, the
surface visibility may not be consistent with its hierarchy order.

Bug: 337995601
Test: A singleTask activity invokes
      startActivity or startActivityIfNeeded to start itself
      during swiping up to home. The end result should show
      home instead of black screen.
Change-Id: Ieda1a3612ccdf6c160690579e9995a2e873466d2