Tabulator: fix selected row in the UI with add_filter

[maximlt]

Just a test for now, it will address #7505 :)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.

Project coverage is 71.81%. Comparing base (4e4c82b) to head (30fb6bd).

Files with missing lines	Patch %	Lines
panel/tests/ui/widgets/test_tabulator.py	0.00%	18 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (4e4c82b) and HEAD (30fb6bd). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (4e4c82b)	HEAD (30fb6bd)
	9	6

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7534      +/-   ##
==========================================
- Coverage   81.75%   71.81%   -9.95%     
==========================================
  Files         339      338       -1     
  Lines       51321    51338      +17     
==========================================
- Hits        41959    36869    -5090     
- Misses       9362    14469    +5107     

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