fix: broken UOM auto complete

[ankush]

closes: #28749

This is broken on newly created sites because during setup we do db_insert which converts None to 0 and inserts it, so DB's column default doesn't work. 🤦

Added patch to toggle on all sites created after the PR was merged.

PS: Only affects newly created sites.

caused by combination of #27993 and #25606

[codecov]

Codecov Report

Merging #29242 (94b8c4d) into develop (c45042c) will decrease coverage by 0.14%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #29242      +/-   ##
===========================================
- Coverage    57.97%   57.83%   -0.15%     
===========================================
  Files         1110     1110              
  Lines        67990    67991       +1     
===========================================
- Hits         39419    39322      -97     
- Misses       28571    28669      +98     

Impacted Files	Coverage Δ
.../setup/setup_wizard/operations/install_fixtures.py	92.99% <ø> (ø)
...unts/report/purchase_register/purchase_register.py	32.19% <0.00%> (-45.90%)	⬇️
...ext/accounts/report/balance_sheet/balance_sheet.py	36.36% <0.00%> (-21.82%)	⬇️
...e_purchase_register/item_wise_purchase_register.py	58.00% <0.00%> (-20.00%)	⬇️
...it_and_loss_statement/profit_and_loss_statement.py	71.42% <0.00%> (-3.90%)	⬇️
...ctype/woocommerce_settings/woocommerce_settings.py	80.76% <0.00%> (-3.85%)	⬇️
...eport/item_variant_details/item_variant_details.py	84.33% <0.00%> (-3.62%)	⬇️
erpnext/assets/doctype/asset/depreciation.py	85.23% <0.00%> (-2.69%)	⬇️
...xt/stock/report/stock_analytics/stock_analytics.py	91.08% <0.00%> (-1.99%)	⬇️
...wise_balance_history/batch_wise_balance_history.py	91.37% <0.00%> (-1.73%)	⬇️
... and 23 more