clobber wom: move onKeyUp focused task on top for triple stem A11y

- If A11y talk back short cut is enabled, the expeceted behavior is
  seeing green circle on current focused task. With early short press
  for stem(config_shortPressEarlyOnStemPrimary), the all_app is launched
  on first press, so, we need to memorize the focused task before that
  and relaunch the focused task upon triple press to keep the task on
  screen the same.

Test: atest WmTests:StemKeyGestureTests
BUG: 311006348
Change-Id: I4d1030c668e5bd10d14249355568b4ec32e29e22