fix(rust): Correct logic for descending sort of BooleanChunked

[wence-]

• Closes Descending sort of boolean series flips number of trues and falses #17557

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.52%. Comparing base (a55d9bc) to head (c62911a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17558      +/-   ##
==========================================
+ Coverage   80.49%   80.52%   +0.03%     
==========================================
  Files        1483     1483              
  Lines      195171   195197      +26     
  Branches     2778     2778              
==========================================
+ Hits       157099   157181      +82     
+ Misses      37561    37505      -56     
  Partials      511      511              

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