added billing window id to the tests for the verifying entries
added billing window id to the tests for the verifying entries

--HG--
branch : feature/rm_invoicing_date_constaints

dannybrowne86/django-timepiece,BocuStudio/django-timepiece,gaga3966/django-timepiece,dannybrowne86/django-timepiece,arbitrahj/django-timepiece,caktus/django-timepiece,caktus/django-timepiece,gaga3966/django-timepiece,josesanch/django-timepiece,caktus/django-timepiece,josesanch/django-timepiece,BocuStudio/django-timepiece,arbitrahj/django-timepiece,arbitrahj/django-timepiece,dannybrowne86/django-timepiece,gaga3966/django-timepiece,josesanch/django-timepiece,BocuStudio/django-timepiece