Don't remove the correct type

Author: alippai

pandas-stubs/_libs/tslibs/offsets.pyi

@@ -59,6 +59,8 @@ class BaseOffset:
     def __radd__(self, other: _DatetimeT) -> _DatetimeT: ...
     @overload
     def __radd__(self, other: _TimedeltaT) -> _TimedeltaT: ...
+    def __sub__(self, other: BaseOffset) -> Self: ...
+    @overload
     def __rsub__(self, other: npt.NDArray[np.object_]) -> npt.NDArray[np.object_]: ...
     @overload
     def __rsub__(self, other: date) -> Timestamp: ...