make last-of-kind per-relay

also fix multiple subscriptions

otherwise wonky things happen

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Nostr/RelayConnection.swift

@@ -148,6 +148,8 @@ func make_nostr_subscription_req(_ filters: [NostrFilter], sub_id: String) -> St
 }
 
 func make_websocket(url: URL) -> WebSocket {
-    return WebSocket(request: URLRequest(url: url), compressionHandler: .none)
+    var req = URLRequest(url: url)
+    //req.setValue("chat,superchat", forHTTPHeaderField: "Sec-WebSocket-Protocol")
+    return WebSocket(request: req, compressionHandler: .none)
 }