fix: race condition in User Location initialization causing MapKit crashes

[Kiruel]

Fixes a crash observed in MKPuckAccuracyLayer during _updateColors by removing redundant CLLocationManager updates in FlutterMapView.swift.

When myLocationEnabled is true, the plugin was redundantly starting locationManager updates while also setting showsUserLocation = true on the MKMapView. This dual-management appeared to cause a race condition or conflict within MapKit's internal layers, leading to EXC_BAD_ACCESS crashes during trait collection changes (e.g., toggling Dark Mode). This PR removes the manual locationManager configuration, relying solely on MKMapView's built-in user location handling.

List which issues are fixed by this PR.

• Fixes crash in MKPuckAccuracyLayer _updateColors (Issue Crash in MKPuckAccuracyLayer _updateColors due to CFStringGetLength (iOS) #81)

Pre-launch Checklist

• I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy].
• I updated CHANGELOG.md to add a description of the change.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making if a test is possible.
• All existing and new tests are passing.