fix: discount ledger entry in case of multicurrency invoice

[nextchamp-saqib]

Problem:
If Discount Accounting is enabled and a discount is applied on a multicurrency invoice, then the ledger entry for the discount is posted with an incorrect base amount.
The base amount i.e debit should be in company currency.

Invoice:

Incorrect GLE:

Correct GLE:

[codecov]

Codecov Report

Merging #31024 (67bd078) into develop (c05144f) will decrease coverage by 0.18%.
The diff coverage is 18.18%.

@@             Coverage Diff             @@
##           develop   #31024      +/-   ##
===========================================
- Coverage    63.01%   62.82%   -0.19%     
===========================================
  Files          983      985       +2     
  Lines        67062    67264     +202     
===========================================
+ Hits         42256    42257       +1     
- Misses       24806    25007     +201     

Impacted Files	Coverage Δ
erpnext/controllers/accounts_controller.py	85.68% <ø> (+0.10%)	⬆️
erpnext/regional/india/e_invoice/utils.py	40.42% <18.18%> (-1.60%)	⬇️
...unts/report/purchase_register/purchase_register.py	34.21% <0.00%> (-44.08%)	⬇️
...ext/accounts/report/balance_sheet/balance_sheet.py	36.36% <0.00%> (-21.82%)	⬇️
...e_purchase_register/item_wise_purchase_register.py	57.42% <0.00%> (-20.80%)	⬇️
erpnext/accounts/doctype/bank/bank.py	71.42% <0.00%> (-14.29%)	⬇️
...em_wise_sales_register/item_wise_sales_register.py	51.13% <0.00%> (-12.22%)	⬇️
...t/accounts/report/sales_register/sales_register.py	70.76% <0.00%> (-7.02%)	⬇️
...urity_shortfall/process_loan_security_shortfall.py	93.75% <0.00%> (-6.25%)	⬇️
erpnext/hr/utils.py	73.10% <0.00%> (-4.63%)	⬇️
... and 58 more