fix: allocate payment amount for split invoices in PE

[GursheenK]

Bug
In Payment Entries, when reference invoices are fetched using the Get Outstanding Invoices button, the automatically allocated amount is calculated incorrectly for invoices split across multiple rows ie. invoices having some payment terms.

Example
When a Payment Entry with amount ₹1000 fetches the outstanding invoices for the party, the automatically allocated amount for invoices ends up as ₹4100 which is greater than the paid amount.

Screen.Recording.2023-09-22.at.12.50.02.PM.mov

Fix

Screen.Recording.2023-09-22.at.1.01.58.PM.mov

Closes #37078

no-docs

[ruthra-kumar]

@GursheenK Fixing this in the server side method that does the term based splitting and allocation will be a better approach.

[codecov]

Codecov Report

Merging #37204 (545f2cc) into develop (b6437e3) will increase coverage by 0.00%.
Report is 11 commits behind head on develop.
The diff coverage is 10.60%.

@@           Coverage Diff            @@
##           develop   #37204   +/-   ##
========================================
  Coverage    66.70%   66.71%           
========================================
  Files          794      794           
  Lines        62491    62495    +4     
========================================
+ Hits         41687    41692    +5     
+ Misses       20804    20803    -1     

Files Changed	Coverage
...ort/stock_ledger_variance/stock_ledger_variance.py	0.00%
...xt/accounts/doctype/payment_entry/payment_entry.py	66.66%
erpnext/accounts/utils.py	75.00%

[stale]

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[ruthra-kumar]

keep alive