Fix a bug in the computation of matroid realization spaces with saturated defining ideal

[LukasKuehne]

Thanks to @danteluber for finding this issue.

[lgoettgens]

Thanks for the PR!
Did this result in a crash or wrong result when called before this change? Could you (if possible) add some test that used to fail but now succeeds?

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.84%. Comparing base (7f7a868) to head (dc5961b).

Files with missing lines	Patch %	Lines
.../MatroidRealizationSpaces/src/realization_space.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5182   +/-   ##
=======================================
  Coverage   84.84%   84.84%           
=======================================
  Files         710      710           
  Lines       95517    95517           
=======================================
  Hits        81045    81045           
  Misses      14472    14472           

Files with missing lines	Coverage Δ
.../MatroidRealizationSpaces/src/realization_space.jl	90.50% <0.00%> (ø)

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[LukasKuehne]

Thanks for the PR! Did this result in a crash or wrong result when called before this change? Could you (if possible) add some test that used to fail but now succeeds?

It crashed before. I added a test with the matroid where this occurred which now works.

[joschmitt]

Thank you!

I cannot judge the mathematics, but the changes look reasonable.