fix: consider qty field precision

[s-aga-r]

Source / Ref: ISS-22-23-06369

Steps to Replicate:

• Create an Item with Stock UOM as Nos and set Units of Measure for a fractional UOM.
  
• Update the Purchase Order Item Conversion Factor Precision to 5 (using Customize Form).
  
• Now, create a Purchase Order for 75.900 Kg (3 Nos), Conversion Factor will be 0.03953. While saving you will get the below error.
  
  

Solution: Consider Qty in Stock UOM Precision while comparing.

[codecov]

Codecov Report

Merging #34713 (4571bd5) into develop (1eefd51) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #34713   +/-   ##
========================================
  Coverage    63.83%   63.83%           
========================================
  Files          810      810           
  Lines        59663    59663           
========================================
  Hits         38088    38088           
  Misses       21575    21575           

Impacted Files	Coverage Δ
erpnext/utilities/transaction_base.py	87.50% <100.00%> (ø)