Fix relative_urls helper for call from initialization code
Fix relative_urls helper for call from initialization code

Addendum to dda68feb00af381dd32e796a0ada2f3476c566de

liqd/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,alkadis/vcv,SysTheron/adhocracy,liqd/adhocracy,SysTheron/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,alkadis/vcv,DanielNeugebauer/adhocracy,alkadis/vcv,SysTheron/adhocracy,alkadis/vcv,liqd/adhocracy,phihag/adhocracy,phihag/adhocracy,alkadis/vcv,liqd/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy