Fix Pin Planner crash

[alaindargelas]

Motivate of the pull request

• [x ] To address an existing issue. If so, please provide a link to the issue:
• Breaking new feature. If so, please describe details in the description part.

Bug: qobject_cast<QComboBox*> returns 0 now the type is ComboBox
Use brute force cast for now.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 14.46%. Comparing base (daf2e2c) to head (57d20a1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PinAssignment/PinAssignmentBaseView.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1710   +/-   ##
=======================================
  Coverage   14.46%   14.46%           
=======================================
  Files         478      478           
  Lines       63819    63819           
  Branches    26088    26116   +28     
=======================================
  Hits         9230     9230           
- Misses      53333    53344   +11     
+ Partials     1256     1245   -11     

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