Input method codehealth small enhancements

This changelist improves:
* HardwareKeyboardShortcutController.java by removing the unnecessary constructor.
* InputMethodDeviceConfigs.java by avoiding reassigning 'mHideImeWhenNoEditorFocus' on every iteration.
* ZeroJankProxy.java Interrupting the current thread in case of
  InterruptedException.

Bug: 368677912
Test: presubmit
Flag: EXEMPT refactoring
Change-Id: I8a99c65bccb7209029087cedbc47b907e5b97b67