feat(android): use borderRadius for floating BottomNavigation

[m1ga]

Currently the radius of a floating bottomNavigation is fixed to 17dpi and the docs are showing wrong information about a XML file to change that. I've added that in https://github.com/tidev/titanium-sdk/pull/12977/commits but it was changed in before merging but the note in the apidocs wasn't removed.

This PR will use the borderRadius to allow it to have a custom borderRadius again.

Example

var win1 = Ti.UI.createWindow();
win1.add(Ti.UI.createLabel({
	text: 'I am window 1.'
}));

var win2 = Ti.UI.createWindow();
win2.add(Ti.UI.createLabel({
	text: 'I am window 2.'
}));

var tab1 = Ti.UI.createTab({
		window: win1,
		title: 'Blue',
		activeTitleColor: "#5555ff",
		titleColor: "#DDDDFF",
		tintColor: "#DDDDFF",
		icon: "appicon.png"
	}),
	tab2 = Ti.UI.createTab({
		window: win2,
		title: 'Red',
		activeTitleColor: "#5555ff",
		titleColor: "#DDDDFF",
		tintColor: "#DDDDFF",
		icon: "appicon.png"
	}),
	tabGroup = Ti.UI.createTabGroup({
		tabs: [tab1, tab2],
		paddingLeft: 15,
		paddingRight: 15,
		paddingBottom: 20,
		experimental: true,
		borderRadius: 100,
		theme: 'Theme.Titanium.Material3.DayNight.NoTitleBar',
		style: Ti.UI.Android.TABS_STYLE_BOTTOM_NAVIGATION,
		tabsBackgroundSelectedColor: "#fff",
		tabsBackgroundColor: "#fff",
		navBarHidden: true
	});
tabGroup.open();

Default size:

with custom borderRadius:

Note: I have to remove the property otherwise it will apply it to the inner window too (only for the experimental:false way.