Update atk-settings.less
Update atk-settings.less

+ @lightestGray
+ tabs to spaces
svisystem/atk4,atk4/atk4,atk4/atk4,xepan/atk4,samratcis/atk4,xepan/atk4,svisystem/atk4,atk4/atk4,svisystem/atk4,samratcis/atk4,atk4/atk4,samratcis/atk4,xepan/atk4