setup_app --system produces annoyingly long module names

[krometis]

e.g., instead of matlab/R2021a we get tinkercliffs-rome/matlab/R2021a. This is confusing in addition to being cumbersome, as any module a user sees on a "tinkercliffs-rome" node is only available to that node type. I think this could be fixed by one of:

1. Removing ${sysdir} from the module path associated with --system
2. Changing MODULEPATH on the clusters
   The first option is cleanest but would change the module names and so break scripts using the existing structure.