fix: update KtorRelayTest to match new signWithAllLoggedInUsers signature

The lambda now receives (relay, template) after RelayAuthenticator was
updated to pass the relay URL for per-relay auth policy checks.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013hTFpoExYYLYEGGtXBx6ZT

geode/src/test/kotlin/com/vitorpamplona/geode/KtorRelayTest.kt

@@ -246,7 +246,7 @@ class KtorRelayTest {
                     com.vitorpamplona.quartz.nip01Core.relay.client.auth.RelayAuthenticator(
                         client = client,
                         scope = scope,
-                    ) { template ->
+                    ) { _, template ->
                         listOf(signer.sign(template))
                     }
                 try {