fix: f32 reduce_min for x86

[heiher]

Shift did not reach only 1 value left.

For f32x8:

// min(4 elements)
m1  = [v0, v1, v2, v3, v4, v5, v6, v7]
m2  = [v4, v5, v6, v7, xx, xx, xx, xx]
min = [v0, v5, v2, v3, xx, xx, xx, xx]

// min(2 elements)
m1  = [v0, v5, v2, v3, xx, xx, xx, xx]
m2  = [v2, v3, xx, xx, xx, xx, xx, xx]
min = [v0, v3, xx, xx, xx, xx, xx, xx]

// min(1 element) (This step is missing now)
m1  = [v0, v3, xx, xx, xx, xx, xx, xx]
m2  = [v3, xx, xx, xx, xx, xx, xx, xx]
min = [v0, xx, xx, xx, xx, xx, xx, xx]

[github-actions]

ACTION NEEDED

Lance follows the Conventional Commits specification for release automation.

The PR title and description are used as the merge commit message. Please update your PR title and description to match the specification.

For details on the error please inspect the "PR Title Check" action.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.97%. Comparing base (8c1ee00) to head (6df7e7d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2385      +/-   ##
==========================================
- Coverage   79.99%   79.97%   -0.03%     
==========================================
  Files         200      200              
  Lines       54519    54529      +10     
  Branches    54519    54529      +10     
==========================================
- Hits        43612    43608       -4     
- Misses       8389     8400      +11     
- Partials     2518     2521       +3     

Flag	Coverage Δ
unittests	79.97% <100.00%> (-0.03%)	⬇️

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