fix: not able to change default BOM in the Subcontracting Order

[rohitwaghchaure]

Issue

1. Create Subcontracting Order and add same item multiple times with different BOM.
2. On save system change the selected BOM to default BOM

[codecov]

Codecov Report

Merging #33760 (11b2994) into develop (6b31c27) will increase coverage by 0.00%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #33760   +/-   ##
========================================
  Coverage    64.14%   64.14%           
========================================
  Files          819      819           
  Lines        59160    59177   +17     
========================================
+ Hits         37946    37962   +16     
- Misses       21214    21215    +1     

Impacted Files	Coverage Δ
...e/subcontracting_receipt/subcontracting_receipt.py	91.39% <0.00%> (-0.50%)	⬇️
...ext/stock/doctype/item_attribute/item_attribute.py	88.09% <0.00%> (-0.28%)	⬇️
erpnext/stock/doctype/pick_list/pick_list.py	77.94% <0.00%> (-0.08%)	⬇️
erpnext/manufacturing/doctype/bom/bom.py	88.08% <0.00%> (+0.09%)	⬆️
erpnext/stock/get_item_details.py	80.78% <0.00%> (+0.17%)	⬆️
erpnext/accounts/doctype/pricing_rule/utils.py	75.72% <0.00%> (+0.48%)	⬆️