JMapPane highlight context should better use the same CoordinateReferenceSystem as the map context to avoid unnecessary transform

This line:
MapContext highlightContext = new DefaultMapContext(DefaultGeographicCRS.WGS84);
can be replace to
MapContext highlightContext = new DefaultMapContext(context.getCoordinateReferenceSystem());

to avoid unnecessary transform.
The transform will cause issues if the map context CoordinateReferenceSystem can't be transform to DefaultGeographicCRS.WGS84.