Fix deletion methods to directly use ID in services

Updated QuestionService and SurveyService to pass the ID directly to the repository's DeleteAsync method. This improves clarity and ensures consistency in how deletions are handled across both services.

Updated SurveyLib

SurveyBackend/SurveyBackend.Services/Services/QuestionService.cs

@@ -38,7 +38,7 @@ public class QuestionService : IQuestionService
             throw new NotFoundException("Question not found");
         }
 
-        await _questionRepository.DeleteAsync(question);
+        await _questionRepository.DeleteAsync(id);
     }
 
     public async Task<QuestionBase> GetQuestionByIdAsync(int id)