fix(ios) : defaultLocale call should not write currentlocale in userdefault

[vijaysingh-axway]

https://jira.appcelerator.org/browse/TIMOB-26612

[build]

	Messages
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[longton95]

FR Passed

Language and Locales are correct when language and region is changed

Test case:

var win = Ti.UI.createWindow({
    backgroundColor: '#fff'
});

var btn = Ti.UI.createButton({
    title: 'Trigger'
});

var label = Ti.UI.createLabel({
    text: 'Sup',
    top: 100,
    color: 'black'
});

btn.addEventListener('click', function () {
    Ti.API.info(Ti.Locale.currentLanguage);
    Ti.API.info(Ti.Locale.currentLocale);
    label.text = 'Current language: ' + Ti.Locale.currentLanguage + ' Locale: ' + Ti.Locale.currentLocale;

});

win.add(btn);
win.add(label);
win.open();

ENV

iPhone 7 Sim (iOS 12.1)
APPC CLI: 7.0.9-3
MacOS: 10.14.2
Node.js Version: 8.12.0
Xcode 10.1