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/SurveyService.cs

@@ -43,7 +43,7 @@ public class SurveyService : ISurveyService
             throw new UnauthorizedException("You are not authorized to delete this survey.");
         }
 
-        await _surveyRepository.DeleteAsync(survey);
+        await _surveyRepository.DeleteAsync(id);
     }
 
     public async Task<IEnumerable<Survey>> GetSurveysAsync()