[EastSussex] fix border button colour
[EastSussex] fix border button colour

change border from green to lightened version of background colour
fixes https://github.com/mysociety/FixMyStreet-Commercial/issues/543

altinukshini/lokalizo,ciudadanointeligente/barriosenaccion,otmezger/fixmystreet,opencorato/barriosenaccion,altinukshini/lokalizo,otmezger/fixmystreet,dracos/fixmystreet,nditech/fixmystreet,nditech/fixmystreet,altinukshini/lokalizo,ciudadanointeligente/barriosenaccion,opencorato/barriosenaccion,appstud/fixmystreet,altinukshini/lokalizo,altinukshini/lokalizo,mhalden/fixmystreet,appstud/fixmystreet,ciudadanointeligente/barriosenaccion,nditech/fixmystreet,appstud/fixmystreet,rbgdigital/fixmystreet,mhalden/fixmystreet,dracos/fixmystreet,opencorato/barriosenaccion,rbgdigital/fixmystreet,antoinepemeja/fixmystreet,dracos/fixmystreet,rbgdigital/fixmystreet,ciudadanointeligente/barriosenaccion,otmezger/fixmystreet,mhalden/fixmystreet,dracos/fixmystreet,otmezger/fixmystreet,rbgdigital/fixmystreet,mhalden/fixmystreet,nditech/fixmystreet,otmezger/fixmystreet,nditech/fixmystreet,antoinepemeja/fixmystreet,rbgdigital/fixmystreet,dracos/fixmystreet,opencorato/barriosenaccion,ciudadanointeligente/barriosenaccion,opencorato/barriosenaccion,appstud/fixmystreet,ciudadanointeligente/barriosenaccion,appstud/fixmystreet,mhalden/fixmystreet,rbgdigital/fixmystreet,opencorato/barriosenaccion,antoinepemeja/fixmystreet,nditech/fixmystreet,antoinepemeja/fixmystreet,otmezger/fixmystreet,otmezger/fixmystreet,antoinepemeja/fixmystreet,opencorato/barriosenaccion,dracos/fixmystreet,ciudadanointeligente/barriosenaccion,antoinepemeja/fixmystreet,nditech/fixmystreet,altinukshini/lokalizo,antoinepemeja/fixmystreet,mhalden/fixmystreet,appstud/fixmystreet,appstud/fixmystreet