fixes a pivot setting bug

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f583634) 94.03% compared to head (11b9be8) 94.52%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ========================================== + Coverage 94.03% 94.52% +0.49% ========================================== Files 15 15 Lines 1240 1242 +2 ========================================== + Hits 1166 1174 +8 + Misses 74 68 -6 ``` | [Files](https://app.codecov.io/gh/algebraic-solving/AlgebraicSolving.jl/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/siggb/linear\_algebra.jl](https://app.codecov.io/gh/algebraic-solving/AlgebraicSolving.jl/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3NpZ2diL2xpbmVhcl9hbGdlYnJhLmps) | `97.00% <100.00%> (+0.06%)` | :arrow_up: | | [src/siggb/update.jl](https://app.codecov.io/gh/algebraic-solving/AlgebraicSolving.jl/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3NpZ2diL3VwZGF0ZS5qbA==) | `88.13% <ø> (ø)` | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/algebraic-solving/AlgebraicSolving.jl/pull/30/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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