Fix save test data (librenms#18439)

sometimes save test data tries to use tcp instead of udp, force udp.

Author: murrant

LibreNMS/Util/ModuleTestHelper.php

@@ -576,6 +576,7 @@ public function generateTestData(string $snmpSimIp, int $snmpSimPort, bool $noSa
             $new_device = new Device([
                 'hostname' => $snmpSimIp,
                 'snmpver' => 'v2c',
+                'transport' => 'udp',
                 'community' => $this->file_name,
                 'port' => $snmpSimPort,
                 'disabled' => 1, // disable to block normal pollers