Fix: VSE: Missing updates when active scene differs from sequencer scene

This was caused by the fact that the sequencer scenes depsgraph was not
active.
There was no reason to not make it active, the original
PR (!140271) just missed this.

The issue became more apparent with !139634.

Pull Request: https://projects.blender.org/blender/blender/pulls/146605

source/blender/windowmanager/intern/wm_event_system.cc

@@ -521,6 +521,7 @@ void wm_event_do_depsgraph(bContext *C, bool is_after_open_file)
         DEG_graph_relations_update(depsgraph);
         DEG_tag_on_visible_update(bmain, depsgraph);
       }
+      DEG_make_active(depsgraph);
       BKE_scene_graph_update_tagged(depsgraph, bmain);
     }