Fix SLURM scripts on SDSC Expanse.

[joaander]

Description

Correct variable names in expanse jinja template.

Motivation and Context

Generate correctly formatted slurm scripts on expanse.

Checklist:

• I am familiar with the Contributing Guidelines.
• I agree with the terms of the Contributor Agreement.
• My name is on the list of contributors.
• The changes introduced by this pull request are covered by existing or newly introduced tests.
• The package documentation and framework documentation in signac-docs are up to date with these changes.
• I have updated the changelog and added any related issue and pull request numbers for future reference.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ba2a3ae) 69.25% compared to head (900f141) 69.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #810      +/-   ##
==========================================
+ Coverage   69.25%   69.27%   +0.02%     
==========================================
  Files          48       48              
  Lines        4397     4397              
  Branches     1065     1065              
==========================================
+ Hits         3045     3046       +1     
+ Misses       1143     1142       -1     
  Partials      209      209              

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[cbkerr]

Thanks!

[joaander]

Thanks to @b-butler for the first pass at this fix. I rebased his changes off the latest main branch.