runIon still using the depreciated np.asfarray method.

When running `topsApp.py --dostep=ion &> ion.log`, an error occured:
```
AttributeError: `np.asfarray` was removed in the NumPy 2.0 release. Use `np.asarray` with a proper dtype instead.
```
This is easily fixed by replacing methods. However, it is better preferable to be updated in the next version.