fix: repeated path collection

Author: OutisLi

deepmd/common.py

@@ -203,8 +203,6 @@ def expand_sys_str(root_dir: Union[str, Path]) -> list[str]:
     """
     root_dir = DPPath(root_dir)
     matches = [str(p.parent) for p in root_dir.rglob("type.raw") if p.is_file()]
-    if (root_dir / "type.raw").is_file():
-        matches.append(str(root_dir))
     return matches