Revert "ping: switch to async style"

This was causing crashes =/

damus/Nostr/RelayConnection.swift

@@ -56,18 +56,15 @@ final class RelayConnection: ObservableObject {
     }
     
     func ping() {
-        Task {
-            do {
-                try await socket.ping()
-            } catch {
-                print("pong failed (\(error)), reconnecting \(self.url.id)")
+        socket.ping { err in
+            if err == nil {
+                self.last_pong = .now
+            } else {
+                print("pong failed, reconnecting \(self.url.id)")
                 self.isConnected = false
                 self.isConnecting = false
                 self.reconnect_with_backoff()
-                return
             }
-            
-            self.last_pong = .now
         }
     }
     

damus/Nostr/WebSocket.swift

@@ -45,16 +45,8 @@ final class WebSocket: NSObject, URLSessionWebSocketDelegate {
         self.session = session
     }
     
-    func ping() async throws -> () {
-        return try await withCheckedThrowingContinuation { cont in
-            self.webSocketTask.sendPing { err in
-                if let err {
-                    cont.resume(throwing: err)
-                } else {
-                    cont.resume(returning: ())
-                }
-            }
-        }
+    func ping(receiveHandler: @escaping (Error?) -> Void) {
+        self.webSocketTask.sendPing(pongReceiveHandler: receiveHandler)
     }
     
     func connect() {