convert: generate better file names for weird layers

gerbolyze/__init__.py

@@ -243,6 +243,7 @@ def convert(input_svg, output_gerbers, is_zip, dilate, curve_tolerance, no_subtr
                 trace_space=trace_space, vectorizer=vectorizer, vectorizer_map=vectorizer_map,
                 exclude_groups=exclude_groups, curve_tolerance=curve_tolerance, only_groups=group_id,
                 outline_mode=(use == 'outline' or use == 'drill'))
+        grb.original_path = Path()
 
         if use == 'drill':
             if side == 'plated':