fix: incorrect Reserved Qty for Production Plan in BIN for the multi-uom case (backport #36162)

[mergify]

This is an automatic backport of pull request #36162 done by Mergify.

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[codecov]

Codecov Report

Merging #36168 (7af3c3d) into develop (3b246fd) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #36168   +/-   ##
========================================
  Coverage    64.08%   64.08%           
========================================
  Files          783      783           
  Lines        60668    60668           
========================================
  Hits         38879    38879           
  Misses       21789    21789           

Impacted Files	Coverage Δ
...cturing/doctype/production_plan/production_plan.py	80.20% <ø> (ø)
...stock/doctype/material_request/material_request.py	74.68% <100.00%> (ø)