Physics interpolation - fix streaking when unhiding nodes

The data flow to the VisualServer of current and previous transforms is essential for allowing correct interpolation. An optimization was present that disabled sending transforms when nodes were hidden, however this meant that when unhidden, nodes would interpolate incorrectly from the last transform received when hiding, rather than the up to date previous transform.

This PR disables the optimization and sends always sends transforms when a node is interpolated.

scene/3d/visual_instance.cpp

@@ -97,18 +97,16 @@ void VisualInstance::_notification(int p_what) {
 
 		} break;
 		case NOTIFICATION_TRANSFORM_CHANGED: {
-			if (_is_vi_visible()) {
+			if (_is_vi_visible() || is_physics_interpolated_and_enabled()) {
 				if (!_is_using_identity_transform()) {
 					Transform gt = get_global_transform();
 					VisualServer::get_singleton()->instance_set_transform(instance, gt);
 				}
 			}
 		} break;
 		case NOTIFICATION_RESET_PHYSICS_INTERPOLATION: {
-			if (_is_vi_visible()) {
-				if (is_physics_interpolated()) {
-					VisualServer::get_singleton()->instance_reset_physics_interpolation(instance);
-				}
+			if (_is_vi_visible() && is_physics_interpolated()) {
+				VisualServer::get_singleton()->instance_reset_physics_interpolation(instance);
 			}
 		} break;
 		case NOTIFICATION_EXIT_WORLD: {