Solution: fix auto charge balance bug

[rkingsbury]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.64%. Comparing base (2afe6ef) to head (8bef6a4).
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/pyEQL/solution.py	83.33%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
+ Coverage   82.24%   82.64%   +0.39%     
==========================================
  Files           9        9              
  Lines        1470     1469       -1     
  Branches      321      322       +1     
==========================================
+ Hits         1209     1214       +5     
+ Misses        220      216       -4     
+ Partials       41       39       -2     

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