Set force translucent by split visibility

In order to ensure right life cycle and visiblity of launcher,
we should still set right translucent state for top root task
by split root visibility changed.

But we also need to prvent b/264690550 happen again. Use a flag
to record current of translucent state and prevent it set after
split entered and become visible.
(It should already set when entering)

Also remove uncessary using of setForceTanslucent on moveToStage
and correct some codes

Fix: 267674372
Test: manual
Test: pass existing tests
Change-Id: Ide8a171435027054e053bb8609d7182bf13cfd84