fix: fix lint problems

Author: ChenZiHong-Gavin

graphgen/common/init_storage.py

@@ -47,7 +47,7 @@ def drop(self):
 
     def reload(self):
         return self.kv.reload()
-    
+
     def ready(self) -> bool:
         return True
 
@@ -116,7 +116,7 @@ def delete_node(self, node_id: str):
 
     def reload(self):
         return self.graph.reload()
-    
+
     def ready(self) -> bool:
         return True