[wm] Adjustment of freeform window position when ime is visible

When IME is triggered by freeform window application, its titlebar is obscured by statusbar and causes touch conflict.
when titlebar is touched, noti bar comes down

Test: atest WindowStateTests
    Also manually using steps:
    1. Launch any activity that has edit text and put in to freeform mode
    2. Resize freeform height such that it overlaps with ime
    3. activate ime
    4. Observe freeform does not invade on to statusbar area

Bug: 144184264
Change-Id: I4ac5a53a018617255cacb173c338257108002703
(cherry-picked from commit 5f0f56d24eec3b5e26f8d505b1aea209508fbaaf)