Jolt: Fix gravity scale not updating when set from code

modules/jolt_physics/objects/jolt_body_3d.cpp

@@ -1246,6 +1246,7 @@ void JoltBody3D::set_gravity_scale(float p_scale) {
 		jolt_settings->mGravityFactor = p_scale;
 	} else {
 		jolt_body->GetMotionPropertiesUnchecked()->SetGravityFactor(p_scale);
+		_update_environmental_properties();
 	}
 }