Revert "Fix certain 3mf models not restoring properly"

This reverts commit 7e38927a8cb76d3789fde21482aeff1e254cc636.

plugins/3MFReader/ThreeMFReader.py

@@ -233,8 +233,7 @@ class ThreeMFReader(MeshReader):
                 if mesh_data is not None:
                     extents = mesh_data.getExtents()
                     if extents is not None:
-                        # We use a different coordinate space, so flip Z and Y
-                        center_vector = Vector(extents.center.x, extents.center.z, extents.center.y)
+                        center_vector = Vector(extents.center.x, extents.center.y, extents.center.z)
                         transform_matrix.setByTranslation(center_vector)
                 transform_matrix.multiply(um_node.getLocalTransformation())
                 um_node.setTransformation(transform_matrix)