Fix bad jackson type modifier for RemoteThrowable object

public static class ThowrableTypeModifier extends TypeModifier {
        @Override
        public JavaType modifyType(JavaType type, Type jdkType,
                TypeBindings context, TypeFactory typeFactory) {
            Class<?> raw = type.getRawClass();
            if (raw.isAssignableFrom(Throwable.class)) {
                return typeFactory.constructType(RemoteThrowable.class);
            }
            return type;
        }
    }