Fixed typo bug from #1782 related to STEP subshape export (#1838)

Author: jmwright

cadquery/occ_impl/exporters/assembly.py

@@ -191,7 +191,7 @@ def _process_child(child: AssemblyProtocol, assy_label: TDF_Label):
 
                 # Step through every face in the shape, and see if any metadata needs to be attached to it
                 for face in shape.Faces():
-                    if face in names or face in shape in colors or face in layers:
+                    if face in names or face in colors or face in layers:
                         # Add the face as a subshape
                         face_label = shape_tool.AddSubShape(part_label, face.wrapped)