Set explicit default values in GeolocateControlOptions

[sdabet-orpheo]

As a follow-up of #1260, set default values for timeout and maximumAge, with respect to https://developer.mozilla.org/en-US/docs/Web/API/Geolocation/getCurrentPosition#syntax.

[aardrop]

Does the JsObjectWrapper always expect a timeout? Can this be a default value for it as well? If so if this is meant to be a default, it could be set as default to the PositionOptions class itself instead.

[sdabet-orpheo]

Does the JsObjectWrapper always expect a timeout? Can this be a default value for it as well? If so if this is meant to be a default, it could be set as default to the PositionOptions class itself instead.

I have made a pull request on mapbox-gl-dart to set default values in PositionOptions, but the repository doesn't seem active anylonger.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.