Reset the frozen recents list state prior to test runs

- A quickswitch will freeze the spatial order of the recents list
  (to allow quickswitching back) for up to 5s, but this can affect
  runs of other tests due to the list being in the wrong order

Bug: 298544839
Test: atest NexusLauncherTests:com.android.quickstep.TaplTestsQuickstep
Change-Id: I5d01991821c6b79ceac47fefffed60ef4a18b248