broadcast-areas: sort imports

Signed-off-by: Toby Lorne <toby.lornewelch-richards@digital.cabinet-office.gov.uk>

tests/app/broadcast_areas/test_broadcast_area.py

@@ -1,6 +1,7 @@
-import pytest
 import re
 
+import pytest
+
 from app.broadcast_areas import (
     BroadcastAreasRepository,
     broadcast_area_libraries,