Fix T65399: crash playing animation after applying smoke flow modifier

missing DEG update.

Reviewers: sergey

Maniphest Tasks: T65399

Differential Revision: https://developer.blender.org/D4996

source/blender/editors/object/object_modifier.c

@@ -1133,6 +1133,7 @@ static int modifier_apply_exec(bContext *C, wmOperator *op)
   }
 
   DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
+  DEG_relations_tag_update(bmain);
   WM_event_add_notifier(C, NC_OBJECT | ND_MODIFIER, ob);
 
   return OPERATOR_FINISHED;