search for desktops by lowercased icccm class if it's different from uppercase
search for desktops by lowercased icccm class if it's different from uppercase

fixes finding firefox and some others

rvandegrift/e,FlorentRevest/Enlightenment,tasn/enlightenment,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tasn/enlightenment,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,rvandegrift/e