Changed color variables to Attributes

As suggested by @rwwiv

Co-authored-by: William Wernert <william.wernert@gmail.com>

salt/common/tools/sbin/so-status

@@ -257,7 +257,7 @@ main() {
           local focus_color; focus_color="$(tput setaf 4)"
           local reset_attr; reset_attr="$(tput sgr0)" # reset all attributes
           fi
-          printf "\n${focus_color:-}%s${NC:-}\n\n" "Checking Docker status"
+          printf "\n${bold}${focus_color:-}%s${reset_attr:-}\n\n" "Checking Docker status"
       fi
 
       systemctl is-active --quiet docker