flake8 fixes

Author: Obada Haddad

src/apps/api/views/submissions.py

@@ -560,7 +560,7 @@ def update_fact_sheet(self, request, pk):
         # Use Queryset to update Submissions
         Submission.objects.filter(Q(parent=top_level_submission) | Q(id=top_level_submission.id)).update(fact_sheet_answers=request_data)
         return Response({})
-    
+
     def paginate_queryset(self, queryset):
         '''
             This Méthode is added to override pagination when trying to download the Sub CSV