Added explicit parentheses to ensure intended order of concat

Co-authored-by: Copilot <[email protected]>

Author: KarmaKamikaze

ChatRPG/Services/GameInputHandler.cs

@@ -230,7 +230,7 @@ private async Task GetResponseAndUpdateState(Campaign campaign, string actionPro
         else
         {
             var response = await _llmClient.GetChatCompletionAsync(campaign, actionPrompt, input);
-            OpenAiGptMessage message = new(MessageRole.Assistant, redirectionPrefix ?? "" + response);
+            OpenAiGptMessage message = new(MessageRole.Assistant, (redirectionPrefix ?? "") + response);
             OnChatCompletionReceived(message);
 
             string? gameOverMessage = null;