Allow IME to attach to the app even with different bounds

- This change was originally added for display areas that are visually
  multi-window but in fullscreen windowing mode and IME need to be
  localized on them.
- Automotive has moved away from using display areas for their windowing
  layout and hence this change is not needed anymore
- Moreoever this change also caused a flicker on some phones when IME is
  showing during orientation change.

Flag: EXEMPT (bugfix)
Fix: 413921056
Test: atest DisplayContentTests
Change-Id: I6c427987df48f391e98c4f202a92306bca0607c7