Allow contact numbers to be destroyed
Allow contact numbers to be destroyed

needed after introducing strong params

alphagov/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,robinwhittleton/whitehall,askl56/whitehall,alphagov/whitehall,hotvulcan/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,askl56/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,ggoral/whitehall,askl56/whitehall,askl56/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,hotvulcan/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall