Adjust placement of message handler.

samples/03_sharded_client/Services/CommandHandlingService.cs

@@ -19,13 +19,12 @@ namespace _03_sharded_client.Services
             _commands = services.GetRequiredService<CommandService>();
             _discord = services.GetRequiredService<DiscordShardedClient>();
             _services = services;
-
-            _discord.MessageReceived += MessageReceivedAsync;
         }
 
         public async Task InitializeAsync()
         {
             await _commands.AddModulesAsync(Assembly.GetEntryAssembly(), _services);
+            _discord.MessageReceived += MessageReceivedAsync;
         }
 
         public async Task MessageReceivedAsync(SocketMessage rawMessage)