Make sure that the wireshark group exists

This it to be consistent with bin/kali-finish-install, where we also
create the wireshark group.

kali-config/common/includes.chroot/usr/lib/live/config/0031-kali-user-setup

@@ -15,6 +15,7 @@ configure_zsh() {
 
 configure_usergroups() {
     addgroup --system kaboxer || true  # Ensures the group exists
+    addgroup --system wireshark || true  # Ensures the group exists
     # kaboxer - for kaboxer
     # dialout - for serial port access
     # wireshark - capture sessions without being root