fix(ios): fix crash when setting navTintColor during a view transition

[hansemannn]

Fixes #13910

After some debugging, it seems like the native TiColor instance that wraps the proposed UIColor can be deallocated, so we explicitly retain it until the color is set async on the UI thread.

Test case:

const win1 = Ti.UI.createWindow({});
win1.add(Ti.UI.createLabel({ text: 'Click', touchEnabled: false }));

const win2 = Ti.UI.createWindow({});

const tab1 = Ti.UI.createTab({ window: win1, title: 'win1' });
const tab2 = Ti.UI.createTab({ window: win2, title: 'win2' });
const tabGroup = Ti.UI.createTabGroup({ tabs: [ tab1, tab2 ] });

tabGroup.open();

win1.addEventListener('click', function () {
	const win3 = Ti.UI.createWindow({ navTintColor: 'red' });
	tabGroup.activeTab.openWindow(win3);

	setTimeout(function () {
		win3.applyProperties({
			navTintColor: 'yellow'
		});
	}, 0);         // <----- 0 = crash, 1000 = no crash
});

[m1ga]

very nice 👍 Works fine

• 12.2.0.GA: crash with 0
• this PR: no crash with 0