Merge pull request #4423 from voxel51/bugfix/launch-app-grp-slice

fix dataset group slice is not being used on launch_app

fiftyone/core/session/session.py

@@ -5,8 +5,8 @@
 | `voxel51.com <https://voxel51.com/>`_
 |
 """
+
 from collections import defaultdict
-from dataclasses import asdict
 from functools import wraps
 
 try:
@@ -417,6 +417,7 @@ def __init__(
             view_name=final_view_name,
             spaces=spaces,
             color_scheme=build_color_scheme(color_scheme, dataset, config),
+            group_slice=(dataset.group_slice if dataset else None),
         )
         self._client = fosc.Client(
             address=address,