FIX: Fixed IBIS differential buffer creation

[maxcapodi78]

Description

Fixed a bug that prevented the creation of a differential pair buffer.

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.85%. Comparing base (bc3a16a) to head (01eb3d1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5947      +/-   ##
==========================================
+ Coverage   82.12%   84.85%   +2.73%     
==========================================
  Files         162      162              
  Lines       62545    62548       +3     
==========================================
+ Hits        51362    53078    +1716     
+ Misses      11183     9470    -1713     

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