Fix mypy issue

[MarcSkovMadsen]

I'm currently updating and rebuilding a lot of projects. One issue I see across is that type of Tabulator.selection is not understood by mypy

error: Incompatible types in assignment (expression has type "list[int]", variable has type "_ListValidateWithCallable")  [assignment]

This PR fixes the issue.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.22%. Comparing base (7afcc90) to head (e4cbe17).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7512   +/-   ##
=======================================
  Coverage   82.21%   82.22%           
=======================================
  Files         339      339           
  Lines       51319    51319           
=======================================
+ Hits        42193    42196    +3     
+ Misses       9126     9123    -3     

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[hoxbro]

The change looks benign. I don't understand why it is needed here and not for other parameters.

Would you happen to know why?

[hoxbro]

Would you happen to know why?

I think it is related to the param not being typed and, therefore, ignored. There is no reason not to merge this.