fix: disable rounded total in opening invoice creation tool

[nextchamp-saqib]

If you try to create an Invoice with grand total of 1000.01, and the Global Default has unchecked Disabled Rounded Total, then you'll face an error:

Solution:
Disable Rounded Total for invoices created from Opening Invoice Creation Tool

[codecov]

Codecov Report

Merging #29789 (a8309c5) into develop (60b55f0) will increase coverage by 10.19%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           develop   #29789       +/-   ##
============================================
+ Coverage    48.86%   59.06%   +10.19%     
============================================
  Files         1112     1112               
  Lines        69567    69567               
============================================
+ Hits         33995    41088     +7093     
+ Misses       35572    28479     -7093     

Impacted Files	Coverage Δ
...ice_creation_tool/opening_invoice_creation_tool.py	62.66% <ø> (ø)
...work_order_stock_report/work_order_stock_report.py	50.00% <0.00%> (-50.00%)	⬇️
.../manufacturing/report/bom_explorer/bom_explorer.py	94.44% <0.00%> (-5.56%)	⬇️
...t/product_bundle_balance/product_bundle_balance.py	79.54% <0.00%> (-2.28%)	⬇️
...e_sales_analytics/supplier_wise_sales_analytics.py	86.88% <0.00%> (-1.64%)	⬇️
...e/period_closing_voucher/period_closing_voucher.py	88.23% <0.00%> (-1.48%)	⬇️
...eport/production_analytics/production_analytics.py	69.51% <0.00%> (-1.22%)	⬇️
erpnext/stock/report/stock_ledger/stock_ledger.py	84.55% <0.00%> (-0.82%)	⬇️
...ctype/accounting_dimension/accounting_dimension.py	64.34% <0.00%> (-0.78%)	⬇️
...rpnext/stock/report/stock_balance/stock_balance.py	79.16% <0.00%> (-0.60%)	⬇️
... and 224 more