Changed sender parameter to channel.

Requests/GetDefaultTTSVoice.cs

@@ -1,3 +1,4 @@
+using HermesSocketServer.Models;
 using HermesSocketServer.Store;
 using ILogger = Serilog.ILogger;
 
@@ -18,9 +19,9 @@ namespace HermesSocketServer.Requests
             _logger = logger;
         }
 
-        public async Task<RequestResult> Grant(string sender, IDictionary<string, object>? data)
+        public async Task<RequestResult> Grant(Channel channel, IDictionary<string, object> data)
         {
-            var user = _users.Get(sender);
+            var user = _users.Get(channel.Id);
             if (user == null)
                 return RequestResult.Failed("Unable to find user data.", notifyClientsOnAccount: false);