fixed codeql issue

Author: AjitPadhi-Microsoft

src/backend/v3/magentic_agents/reasoning_search.py

@@ -29,8 +29,6 @@ async def initialize(self, kernel: Kernel) -> bool:
             return False
 
         try:
-            # credential = SyncDefaultAzureCredential()
-
             self.search_client = SearchClient(endpoint=self.search_config.endpoint, 
                                               credential=AzureKeyCredential(self.search_config.api_key), 
                                               index_name=self.search_config.index_name)