Fix charge density task_ids list query

[munrojm]

Fixes a bug where task_id list queries were not getting formatted properly for the charge density related methods.

[codecov-commenter]

Codecov Report

Base: 81.18% // Head: 81.23% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (5cb5e66) compared to base (17dd2cc).
Patch coverage: 57.14% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #707      +/-   ##
==========================================
+ Coverage   81.18%   81.23%   +0.04%     
==========================================
  Files          36       36              
  Lines        1733     1737       +4     
==========================================
+ Hits         1407     1411       +4     
  Misses        326      326              

Impacted Files	Coverage Δ
mp_api/client/routes/charge_density.py	67.16% <57.14%> (+2.08%)	⬆️

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