Short-term archiving results in incorrect contents for rpointer.glc files

When applying short-term archiving to runs with an active GLC component (e.g., dynamic Greenland ice sheet), the contents of the `rpointer.glc` files are incorrectly communicated to the archived version of the file. E.g., for an `rpointer.glc` file that should have the following contents:

`2079-12-21_00:00:00`

After short-term archiving, the file has the following inside of it instead:

`./mali.rst.2079-12-21_00:00:00.nc`

I suspect this is simply because the current tool was configured to work with CISM (?), which may assume formats similar to other CESM / E3SM components for GLC, as opposed to assuming an MPAS-component-like format for the timestamp (which MALI uses).