removed "sms://" prefix on spomc backend
removed "sms://" prefix on spomc backend

ken-muturi/rapidsms,caktus/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms,ehealthafrica-ci/rapidsms,eHealthAfrica/rapidsms,rapidsms/rapidsms-core-dev,peterayeni/rapidsms,unicefuganda/edtrac,dimagi/rapidsms-core-dev,ken-muturi/rapidsms,dimagi/rapidsms-core-dev,ehealthafrica-ci/rapidsms,dimagi/rapidsms,caktus/rapidsms,peterayeni/rapidsms,eHealthAfrica/rapidsms,catalpainternational/rapidsms,lsgunth/rapidsms,peterayeni/rapidsms,ehealthafrica-ci/rapidsms,caktus/rapidsms,ken-muturi/rapidsms,catalpainternational/rapidsms,lsgunth/rapidsms,rapidsms/rapidsms-core-dev,unicefuganda/edtrac,eHealthAfrica/rapidsms,unicefuganda/edtrac,catalpainternational/rapidsms,catalpainternational/rapidsms,lsgunth/rapidsms,dimagi/rapidsms