Fix latest clickhouse vector schema change (#6385)

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Fixes https://github.com/hwchase17/langchain/issues/6208

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langchain/vectorstores/clickhouse.py

@@ -68,7 +68,7 @@ class ClickhouseSettings(BaseSettings):
 
     index_type: str = "annoy"
     # Annoy supports L2Distance and cosineDistance.
-    index_param: Optional[Union[List, Dict]] = [100, "'L2Distance'"]
+    index_param: Optional[Union[List, Dict]] = ["'L2Distance'", 100]
     index_query_params: Dict[str, str] = {}
 
     column_map: Dict[str, str] = {