Ensure column subset is retained on Tabulator.style

[philippjfr]

Fixes #6558

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 82.95%. Comparing base (f40ca93) to head (c6b459b).

Files	Patch %	Lines
panel/util/__init__.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6560      +/-   ##
==========================================
- Coverage   82.97%   82.95%   -0.02%     
==========================================
  Files         313      313              
  Lines       46001    46014      +13     
==========================================
+ Hits        38169    38172       +3     
- Misses       7832     7842      +10     

Flag	Coverage Δ
ui-tests	40.06% <12.50%> (-0.02%)	⬇️
unitexamples-tests	71.21% <93.75%> (-0.01%)	⬇️

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