fix: remove duplicated reading model deviation files (#1762)

The line I removed seems to be unused. xref:
1c18b1c

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## Summary by CodeRabbit

- **Refactor**
- Improved consistency in reading model deviation data by using a
unified helper function for file processing.

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Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>

Author: njzjz

dpgen/generator/run.py

@@ -2477,7 +2477,6 @@ def _select_by_model_devi_adaptive_trust_low(
     for tt in modd_system_task:
         with warnings.catch_warnings():
             warnings.simplefilter("ignore")
-            model_devi = np.loadtxt(os.path.join(tt, "model_devi.out"))
             model_devi = _read_model_devi_file(
                 tt, model_devi_f_avg_relative, model_devi_merge_traj
             )