Logic in case_st_archive doesn't allow multi-instance cases with mpas components

The logic in case_st_archive.py: `_archive_history_files` does not handle the possibility that we could have an mpas component (which has a different pattern for history file names) in a multi-instance run. @kdraeder changed this logic in #1916 but the fundamental problem still remains. In that PR, this is noted explicitly:

```python
if ninst_string:
if compname.find('mpas') == 0:
# Not correct, but MPAS' multi-instance name format is unknown.
newsuffix = compname + '.*' + suffix
```