Update RoutingService.InstructLoop.cs

hotfix GetNextStepPrompt error(can't find naive reasoner template)

Author: Oceania2018

src/Infrastructure/BotSharp.Core/Routing/RoutingService.InstructLoop.cs

@@ -15,7 +15,7 @@ public async Task<RoleDialogModel> InstructLoop(Agent agent, RoleDialogModel mes
         var convService = _services.GetRequiredService<IConversationService>();
         var storage = _services.GetRequiredService<IConversationStorage>();
 
-        _router = await agentService.GetAgent(message.CurrentAgentId);
+        _router = agent;
 
         var states = _services.GetRequiredService<IConversationStateService>();
         var executor = _services.GetRequiredService<IExecutor>();