Fix legacy CA value setter
Fix legacy CA value setter

The attribute id and type are automatically set with attributable
property. This property also allows verifiers access to the attributable
object which is needed to verify the custom attribute value.

andrei-karalionak/ggrc-core,selahssea/ggrc-core,edofic/ggrc-core,j0gurt/ggrc-core,selahssea/ggrc-core,edofic/ggrc-core,AleksNeStu/ggrc-core,edofic/ggrc-core,josthkko/ggrc-core,j0gurt/ggrc-core,plamut/ggrc-core,VinnieJohns/ggrc-core,plamut/ggrc-core,edofic/ggrc-core,plamut/ggrc-core,josthkko/ggrc-core,josthkko/ggrc-core,VinnieJohns/ggrc-core,josthkko/ggrc-core,andrei-karalionak/ggrc-core,plamut/ggrc-core,selahssea/ggrc-core,j0gurt/ggrc-core,VinnieJohns/ggrc-core,kr41/ggrc-core,AleksNeStu/ggrc-core,AleksNeStu/ggrc-core,selahssea/ggrc-core,VinnieJohns/ggrc-core,andrei-karalionak/ggrc-core,kr41/ggrc-core,kr41/ggrc-core,AleksNeStu/ggrc-core,andrei-karalionak/ggrc-core,j0gurt/ggrc-core,kr41/ggrc-core