Remove unnecessary display_name method on Request
Remove unnecessary display_name method on Request

Special display_name method was needed for Request when it was without
title/name (see commit #30e0ce6c3b127f1d3be6436cd20b4e44df83c2ad).

For a while now Request has a title and therefore there is no need for
a special case method.

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