Incorrect permission check on iOS for StartListeningAsync + AllowBackgroundUpdates

[Evan C Masseau]

Bug Information

Version Number of Plugin: 4.6.2
Device Tested On: iPhone iOS 12.4
Simulator Tested On: iOS v11, 12, 13
Version of VS: VS for Mac 2019 8.7.7
Version of Xamarin: Xamarin Forms 4.8
Versions of other things you are using: n/a

Steps to reproduce the Behavior

• Configure iOS project with UIBackgroundModes for location, and all the Location Usage descriptions.
• Invoke CrossGeolocator.Current.StartListeningAsync on iOS, with AllowBackgroundUpdates set to true
• When prompted for location access permission, select "When In Use" or "Allow Once" (if iOS 13+). Not "Always"

Expected Behavior

• Geolocator should start listening for location updates. When In Use permission is supposed to be sufficient in the above scenario.

Actual Behavior

Geolocator plugin throws a GeolocationException with permission unauthorized.

Code snippet

            try
            {
                await CrossGeolocator.Current.StartListeningAsync(
                    TimeSpan.FromMilliseconds(5000),
                    50,
                    true,
                    new ListenerSettings
                    {
                        ActivityType = ActivityType.AutomotiveNavigation,
                        AllowBackgroundUpdates = true,
                        PauseLocationUpdatesAutomatically = false,
                        ListenForSignificantChanges = false
                    }
                );
            }
            catch (Exception exception)
            {
//Catches a Geolocator error if I choose "When In Use"
                OnLocationError?.Invoke(this, exception);
            }

PS thanks so much for developing this library, it works great.