Fix staring window being hide after AR#commitVisibility

For legacy app transition, a visible activity could commit visibility
after transition start, so it won't clear the policy visibility flag
on starting window immediately. But for shell transition, there will
call commit visibility immediately after setVisibility, which let
the starting window be hidden with policy visibility flag.
To make the condition more generic, also check firstWindowDrawn or
allDrawn before clear the flag.

Bug: 199363064
Test: No change when using app transition.
Test: Enable shell transition, check the starting window is really
visible on SF layer when launch app.

Change-Id: I93a9f23c8d686c7bd176ae2806c28675562efc53