Add supports_slicing_ordering_in_compound.

Author: WaVEV

django_mongodb/features.py

@@ -23,6 +23,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_select_difference = False
     supports_select_intersection = False
     supports_sequence_reset = False
+    supports_slicing_ordering_in_compound = True
     supports_table_check_constraints = False
     supports_temporal_subtraction = True
     # MongoDB stores datetimes in UTC.