Fix import in test_assigning

Author: sgreenbury

tests/test_assigning.py

@@ -1,7 +1,7 @@
 import pandas as pd
 import pytest
 
-from acbm.assigning.assigning import _map_day_to_wkday_binary
+from acbm.assigning.feasible_zones_primary import _map_day_to_wkday_binary
 
 # applying to a single value