Fix error when calling close() on a dgram socket multiple times

src/js/node/dgram.ts

@@ -708,7 +708,7 @@ Socket.prototype.close = function (callback) {
   }
 
   state.receiving = false;
-  state.handle.socket?.close();
+  state.handle?.socket?.close();
   state.handle = null;
   defaultTriggerAsyncIdScope(this[async_id_symbol], process.nextTick, socketCloseNT, this);