Fix use of deprecated get_offset_position

Author: PatrickPijnappel

packages/python/plotly/plotly/matplotlylib/mplexporter/exporter.py

@@ -285,16 +285,13 @@ def draw_collection(
             "zorder": collection.get_zorder(),
         }
 
-        offset_dict = {"data": "before", "screen": "after"}
-        offset_order = offset_dict[collection.get_offset_position()]
-
         self.renderer.draw_path_collection(
             paths=processed_paths,
             path_coordinates=path_coords,
             path_transforms=path_transforms,
             offsets=offsets,
             offset_coordinates=offset_coords,
-            offset_order=offset_order,
+            offset_order="after",
             styles=styles,
             mplobj=collection,
         )