Redid kirsanium xform fix

src/core/Transform.cpp

@@ -74,8 +74,8 @@ Plane Transform::xform_inv(const Plane& p_plane) const {
 
 	Vector3 point=p_plane.normal*p_plane.d;
 	Vector3 point_dir=point+p_plane.normal;
-	xform_inv(point);
-	xform_inv(point_dir);
+	point=xform_inv(point);
+	point_dir=xform_inv(point_dir);
 
 	Vector3 normal=point_dir-point;
 	normal.normalize();