[TIMOB-15613] Ti.Map.View always asks for permission to use current location

When `showsUserLocation` is set to `YES` on init, then the user will get a popup asking for permission, even whith `Ti.Map.createView({ userLocation: false});` or when this property is unset. This fixes it by using the `userLocation` value.

Ticket: https://jira.appcelerator.org/browse/TC-3204