Fix property name in twig extension
Fix property name in twig extension

Nek-/KnpMenuBundle,WouterJ/KnpMenuBundle,javiereguiluz/KnpMenuBundle,KnpLabs/KnpMenuBundle,Soullivaneuh/KnpMenuBundle,benji07/KnpMenuBundle,bocharsky-bw/KnpMenuBundle,stof/KnpMenuBundle,piotrantosik/KnpMenuBundle,craue/MenuBundle,Soullivaneuh/KnpMenuBundle