dashboard: htmlEncode graph target list content
dashboard: htmlEncode graph target list content

same XSS vulnerability as the composer saved user graphs data view had

cbowman0/graphite-web,cbowman0/graphite-web,criteo-forks/graphite-web,graphite-project/graphite-web,drax68/graphite-web,deniszh/graphite-web,criteo-forks/graphite-web,deniszh/graphite-web,cbowman0/graphite-web,drax68/graphite-web,drax68/graphite-web,deniszh/graphite-web,criteo-forks/graphite-web,criteo-forks/graphite-web,cbowman0/graphite-web,cbowman0/graphite-web,drax68/graphite-web,cbowman0/graphite-web,drax68/graphite-web,deniszh/graphite-web,graphite-project/graphite-web,criteo-forks/graphite-web,criteo-forks/graphite-web,graphite-project/graphite-web,deniszh/graphite-web,graphite-project/graphite-web,graphite-project/graphite-web,deniszh/graphite-web,graphite-project/graphite-web,drax68/graphite-web