Cleanup for SC locpot

[jmmshn]

Summary

Small change to API for get_sc_locpot

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 90.39%. Comparing base (ed4cb1a) to head (4ba995d).
Report is 6 commits behind head on main.

Files	Patch %	Lines
pymatgen/analysis/defects/thermo.py	50.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
+ Coverage   90.35%   90.39%   +0.03%     
==========================================
  Files          11       11              
  Lines        2116     2123       +7     
  Branches      407      411       +4     
==========================================
+ Hits         1912     1919       +7     
+ Misses        117      115       -2     
- Partials       87       89       +2     

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