Remove pointless and large designer file.
Remove pointless and large designer file.

jskeet/nodatime,jskeet/nodatime,zaccharles/nodatime,malcolmr/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,zaccharles/nodatime,zaccharles/nodatime,nodatime/nodatime,zaccharles/nodatime,malcolmr/nodatime,malcolmr/nodatime,zaccharles/nodatime,zaccharles/nodatime,nodatime/nodatime,BenJenkinson/nodatime