Update OpenImeWindowFromFixedOrientationAppTest

To detect IME gone bugs 230733128 in ShellTransition with following
refined test steps:
  - Launch the activity with expecting IME will be shown.
  - Swiping out the IME activity to home.
  - Bring the exist IME activity to the front in landscape mode
    device rotation.

Fix: 232242249
Test: atest FlickerTest:OpenImeWindowFromFixedOrientationAppTest
Change-Id: I0148545ed19f52c58e0f45d578e6fe5634d1cc06