Use old IME Switch menu on watch and small screen

This ensures the pre-existing IME Switcher menu is used on watch
devices, as these override the previous layouts, and won't correspond to
the logic in InputMethodMenuControllerNew.

Additionally, this disabled the menu for small screen devices.

Test: flash on watch and adb shell input keyevent KEYCODE_SYM to show
  the menu. flash on phone and set small display size.
Bug: 311791923
Flag: android.view.inputmethod.ime_switcher_revamp
Change-Id: I19d46f4351f8f52636d622b433c2c15e77b77953