fix: Ignore default payment terms template for opening invoices

[deepeshgarg007]

Fixes: #38389

Opening invoices should not consider default payment terms template

[codecov]

Codecov Report

Attention: 89 lines in your changes are missing coverage. Please review.

Comparison is base (33b631e) 60.03% compared to head (53bf44d) 60.04%.
Report is 112 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #39256    +/-   ##
=========================================
  Coverage    60.03%   60.04%            
=========================================
  Files          761      761            
  Lines        70122    70456   +334     
=========================================
+ Hits         42099    42304   +205     
- Misses       28023    28152   +129     

Files	Coverage Δ
...xt/accounts/doctype/journal_entry/journal_entry.py	66.54% <100.00%> (+0.51%)	⬆️
...ounts/doctype/purchase_invoice/purchase_invoice.py	70.30% <100.00%> (+0.12%)	⬆️
...next/accounts/doctype/subscription/subscription.py	77.97% <100.00%> (+0.25%)	⬆️
erpnext/accounts/party.py	81.42% <100.00%> (+0.30%)	⬆️
erpnext/controllers/sales_and_purchase_return.py	91.18% <100.00%> (+0.57%)	⬆️
erpnext/hooks.py	100.00% <100.00%> (ø)
erpnext/manufacturing/doctype/bom/bom.py	73.32% <100.00%> (+0.75%)	⬆️
erpnext/regional/united_arab_emirates/utils.py	38.38% <100.00%> (ø)
erpnext/setup/install.py	23.14% <ø> (-0.07%)	⬇️
erpnext/setup/setup_wizard/setup_wizard.py	75.86% <ø> (ø)
... and 22 more

... and 28 files with indirect coverage changes