fix ios staus bar icon colors

lib/src/channel_header.dart

@@ -78,6 +78,7 @@ class ChannelHeader extends StatelessWidget implements PreferredSizeWidget {
   Widget build(BuildContext context) {
     final channel = StreamChannel.of(context).channel;
     return AppBar(
+      brightness: Theme.of(context).brightness,
       elevation: 1,
       leading: showBackButton
           ? StreamBackButton(onPressed: onBackPressed)

lib/src/message_actions_modal.dart

@@ -58,7 +58,7 @@ class MessageActionsModal extends StatelessWidget {
                 sigmaY: 10.8731,
               ),
               child: Container(
-                color: Colors.black.withOpacity(0.2),
+                color: Colors.black.withOpacity(0.1),
               ),
             ),
           ),

lib/src/message_reactions_modal.dart

@@ -49,7 +49,7 @@ class MessageReactionsModal extends StatelessWidget {
                 sigmaY: 10.8731,
               ),
               child: Container(
-                color: Colors.black.withOpacity(0.2),
+                color: Colors.black.withOpacity(0.1),
               ),
             ),
           ),