fix: default value for allow neg stock in repost_item_valuation

[ankush]

Negative stock can be toggled back after queuing transactions, this
causes failure when repost is executed.

Now allow_negative_stock stock is set at time of queuing the repost job.
This means setting changes done afterwards won't affect already
submitted reposts.

[codecov]

Codecov Report

Merging #28320 (485372c) into develop (6954dd6) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop   #28320      +/-   ##
===========================================
+ Coverage    55.16%   55.23%   +0.06%     
===========================================
  Files         1119     1119              
  Lines        66534    66539       +5     
===========================================
+ Hits         36703    36751      +48     
+ Misses       29831    29788      -43     

Impacted Files	Coverage Δ
...ype/repost_item_valuation/repost_item_valuation.py	66.66% <100.00%> (+0.32%)	⬆️
erpnext/stock/report/stock_ledger/stock_ledger.py	74.79% <0.00%> (-3.26%)	⬇️
erpnext/education/doctype/student/student.py	73.68% <0.00%> (-3.16%)	⬇️
...ion/doctype/course_enrollment/course_enrollment.py	44.00% <0.00%> (-2.00%)	⬇️
...eorder_level/itemwise_recommended_reorder_level.py	92.30% <0.00%> (-1.93%)	⬇️
.../hr/doctype/upload_attendance/upload_attendance.py	44.69% <0.00%> (-1.52%)	⬇️
...nk_reconciliation_tool/bank_reconciliation_tool.py	44.11% <0.00%> (-1.07%)	⬇️
erpnext/selling/doctype/sales_order/sales_order.py	76.67% <0.00%> (-0.38%)	⬇️
...ext/payroll/doctype/payroll_entry/payroll_entry.py	70.79% <0.00%> (-0.24%)	⬇️
erpnext/accounts/utils.py	59.23% <0.00%> (+0.18%)	⬆️
... and 14 more