[TIMOB-26288] Android: Add ability to hide/show back button on Window

We implemented the ability to hide the back-button on iOS (enabled by default) via TIMOB-25871. For Android, the back-button (home indicator) is not shown, but for parity sake, we should make this toggleable (on creation only). Right now, the following needs to done for every sub-window:

function onOpen() {
	const actionBar = $.window.getActivity().getActionBar();

	if (actionBar !== null) {
		actionBar.displayHomeAsUp = true;
		actionBar.onHomeIconItemSelected = close;
	}
}

Having a property and doing this internally would be a huge cross-platform shared parity-code improvement, especially for larger scaled apps. On long-term, this should part of the Ti.UI.NavigationWindow effort, but I think this did not gain much love so far.