fix: Enable enhanced map for C# repo map test

Co-authored-by: cecli (openai/gemini_cli/gemini-2.5-pro)

Author: szmania

tests/basic/test_repomap.py

@@ -577,7 +577,7 @@ def _test_language_repo_map(self, lang, key, symbol):
                 f.write(content)
 
             io = InputOutput()
-            repo_map = RepoMap(main_model=self.GPT35, io=io)
+            repo_map = RepoMap(main_model=self.GPT35, io=io, use_enhanced_map=True)
             other_files = [test_file]
             result = repo_map.get_repo_map([], other_files)
             dump(lang)