Add missing counter to ROBOT (3.2)

We missed somehow to add in the big while loop to add the fact that ROBOT is a vulnerability which became
apparent with #2967 (3.3dev).

This PR adds that for 3.2 also. See #2968.

testssl.sh

@@ -24325,6 +24325,7 @@ parse_cmd_line() {
                     ;;
                -BB|--BB|--robot)
                     do_robot=true
+                    ((VULN_COUNT++))
                     ;;
                -R|--renegotiation)
                     do_renego=true