(antu) fix tunnel module name

Author: csilva-cl

fleet/lib/kube-prometheus-stack/overlays/antu/values.yaml

@@ -143,7 +143,7 @@ prometheus:
       - job_name: blackbox-snmp-arista-tunnel
         metrics_path: /snmp
         params:
-          module: [arista-tunnel]
+          module: [arista_tunnel]
           auth: [rubin_v2]
         file_sd_configs:
           - files: