fix: change Grid Peak Shaving switch into 4th storage mode

[mkuthan]

Closes #111
See also: Pho3niX90/solis_modbus#82

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.44%. Comparing base (4f079a9) to head (00b4665).
⚠️ Report is 7 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
custom_components/solis_cloud_control/select.py	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
+ Coverage   98.28%   98.44%   +0.15%     
==========================================
  Files          21       21              
  Lines        1573     1539      -34     
  Branches      168      165       -3     
==========================================
- Hits         1546     1515      -31     
+ Misses         16       14       -2     
+ Partials       11       10       -1     

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[github-actions]

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