fix: remove unused destroy() from ForwardKind0ToLocalRelayState

EventCollector lives for the lifetime of Account, matching the same
pattern used by CacheClientConnector — no explicit teardown needed.

https://claude.ai/code/session_01Er9VV7nHyDb5pihrunb81F

amethyst/src/main/java/com/vitorpamplona/amethyst/model/localRelays/ForwardKind0ToLocalRelayState.kt

@@ -39,8 +39,4 @@ class ForwardKind0ToLocalRelayState(
                 }
             }
         }
-
-    fun destroy() {
-        eventCollector.destroy()
-    }
 }