Fix add pins triangle

[joamatab]

fixes https://github.com/gdsfactory/gdsfactory/issues/2864

thanks to @duarte-jfs for the issue and suggested fixes

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.10%. Comparing base (232d9d8) to head (a00fcbb).

Files	Patch %	Lines
gdsfactory/component.py	50.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2868 +/- ## ========================================== + Coverage 68.99% 69.10% +0.10% ========================================== Files 298 298 Lines 15348 15347 -1 Branches 2256 2256 ========================================== + Hits 10590 10605 +15 + Misses 4155 4134 -21 - Partials 603 608 +5 ```

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