fix bottom sheet and channel name

lib/src/channel_bottom_sheet.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:stream_chat/stream_chat.dart';
 import 'package:stream_chat_flutter/src/stream_svg_icon.dart';
 import 'package:stream_chat_flutter/src/utils.dart';
+import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 import 'channel_info.dart';
 import 'channel_name.dart';
@@ -12,13 +13,11 @@ import 'user_avatar.dart';
 class ChannelBottomSheet extends StatelessWidget {
   const ChannelBottomSheet({
     Key key,
-    @required this.channel,
   }) : super(key: key);
 
-  final Channel channel;
-
   @override
   Widget build(BuildContext context) {
+    final channel = StreamChannel.of(context).channel;
     return SafeArea(
       child: Padding(
         padding: const EdgeInsets.all(8.0),