fix allowSelfSigned on flutter_web

@@ -19,8 +19,13 @@ class BaseWebSocket {
   SocketNotifier socketNotifier = SocketNotifier();
   Duration ping;
   bool isDisposed = false;
+  bool allowSelfSigned;
 
-  BaseWebSocket(this.url, {this.ping = const Duration(seconds: 5)}) {
+  BaseWebSocket(
+    this.url, {
+    this.ping = const Duration(seconds: 5),
+    this.allowSelfSigned = true,
+  }) {
     url = url.startsWith('https')
         ? url.replaceAll('https:', 'wss:')
         : url.replaceAll('http:', 'ws:');

@@ -7,7 +7,7 @@ class BaseWebSocket {
   BaseWebSocket(
     this.url, {
     this.ping = const Duration(seconds: 5),
-    allowSelfSigned = true,
+    this.allowSelfSigned = true,
   }) {
     throw 'To use sockets you need dart:io or dart:html';
   }