tests: correct usage of DHCPRelay and DHCPServer tests

Author: jaredhendrickson13

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsDHCPRelayTestCase.inc

@@ -32,7 +32,7 @@ class APIModelsDHCPRelayTestCase extends TestCase {
         # Ensure we can enable the DHCPRelay
         $this->assert_does_not_throw(
             callable: function () {
-                $dhcp_relay = new DHCPRelay(enable: true);
+                $dhcp_relay = new DHCPRelay(enable: true, server: ["1.2.3.4"]);
                 $dhcp_relay->update();
             },
         );

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsDHCPServerTestCase.inc

@@ -43,7 +43,7 @@ class APIModelsDHCPServerTestCase extends TestCase {
                 $dhcp_server = new DHCPServer(id: 'lan', async: false);
 
                 # Temporarily change the `lan` interface to use dhcp IPv4
-                Model::set_config('dhcrelay/0/interface', 'lan');
+                Model::set_config('dhcrelay/interface', 'lan');
 
                 # Try to enable the DHCP server
                 $dhcp_server->validate_enable(enable: true);