fix: Incorrect null count in rolling_min/max

[orlp]

Fixes #23066.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.26%. Comparing base (7768a67) to head (89c8bbb).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #23073   +/-   ##
=======================================
  Coverage   80.25%   80.26%           
=======================================
  Files        1684     1684           
  Lines      223961   223967    +6     
  Branches     2808     2808           
=======================================
+ Hits       179743   179762   +19     
+ Misses      43558    43545   -13     
  Partials      660      660           

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