chore: remove one un-useful line

Author: Franklalalala

dftio/io/abacus/abacus_parser.py

@@ -395,7 +395,6 @@ def add_h0_delta_h(self, h0_src_root, old_lmdb_path, new_lmdb_path, keep_old_lmd
         os.makedirs(new_lmdb_path, exist_ok=True)
         counter = 0
         batch_size = 50
-        batch_count = 0
 
         # Process in batches
         for batch_start in tqdm(range(0, len(valid_idx_list), batch_size), desc="Processing batches"):