some more redundant csrf code removed
some more redundant csrf code removed


Former-commit-id: 98db4ee11255e90f9f61ae5005820e7d3576fc9d
dvla/vehicles-online,dvla/vrm-retention-online,dvla/vrm-retention-online,dvla/vehicles-presentation-common,dvla/vrm-retention-online,dvla/vehicles-presentation-common,dvla/vehicles-online,dvla/vrm-retention-online,dvla/vehicles-presentation-common,dvla/vehicles-online,dvla/vehicles-online