Fix refactoring in tooltips

[Tanya-Solyanik]

Introduced in ca1199e -

Tooltip owner window is used for tooltip placement when tool is not a control, this is the case of ToolStripItems.

Microsoft Reviewers: Open in CodeFlow

[elachlan]

Test failure unrelated.

System.Windows.Forms.Tests.ClipboardTests.Clipboard_SetText_InvokeStringTextDataFormat_GetReturnsExpected(format: Text)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 74.26649%. Comparing base (31176a4) to head (0433fde).
Report is 5 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11388         +/-   ##
===================================================
- Coverage   74.27181%   74.26649%   -0.00532%     
===================================================
  Files           3025        3025                 
  Lines         626861      626852          -9     
  Branches       46742       46740          -2     
===================================================
- Hits          465581      465541         -40     
- Misses        157935      157958         +23     
- Partials        3345        3353          +8     

Flag	Coverage Δ
Debug	74.26649% <0.00000%> (-0.00532%)	⬇️
integration	17.98313% <0.00000%> (-0.01878%)	⬇️
production	46.98492% <0.00000%> (-0.01257%)	⬇️
test	96.99415% <ø> (ø)
unit	43.97002% <0.00000%> (+0.00208%)	⬆️

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