Fix the timeout value (#5352)

src/pages/EditMonitor.vue

@@ -1443,12 +1443,15 @@ message HealthCheckResponse {
                 }
             }
 
+            // Set a default timeout if the monitor type has changed or if it's a new monitor
+            if (oldType || this.isAdd) {
                 if (this.monitor.type === "snmp") {
                 // snmp is not expected to be executed via the internet => we can choose a lower default timeout
                     this.monitor.timeout = 5;
                 } else {
                     this.monitor.timeout = 48;
                 }
+            }
 
             // Set default SNMP version
             if (!this.monitor.snmpVersion) {