fix: incorrect job card status

[ankush]

• Fix incorrect job card status. use completed quantity instead of transfer qty for 'Completed' status
• unrelated fix: possible runtime error when modifying dict and its keys() iterators together.

[codecov]

Codecov Report

Merging #28224 (3176912) into develop (aed45f2) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop   #28224      +/-   ##
===========================================
- Coverage    55.18%   55.13%   -0.06%     
===========================================
  Files         1117     1117              
  Lines        66491    66491              
===========================================
- Hits         36695    36657      -38     
- Misses       29796    29834      +38     

Impacted Files	Coverage Δ
erpnext/manufacturing/doctype/job_card/job_card.py	64.45% <100.00%> (ø)
erpnext/stock/doctype/stock_entry/stock_entry.py	79.76% <100.00%> (ø)
...work_order_stock_report/work_order_stock_report.py	50.00% <0.00%> (-50.00%)	⬇️
erpnext/stock/report/stock_ageing/stock_ageing.py	88.32% <0.00%> (-3.65%)	⬇️
erpnext/education/doctype/student/student.py	73.68% <0.00%> (-3.16%)	⬇️
...xt/stock/report/stock_analytics/stock_analytics.py	91.08% <0.00%> (-2.98%)	⬇️
erpnext/assets/doctype/asset/depreciation.py	84.44% <0.00%> (-2.97%)	⬇️
...ion/doctype/course_enrollment/course_enrollment.py	44.00% <0.00%> (-2.00%)	⬇️
...ctype/accounting_dimension/accounting_dimension.py	64.06% <0.00%> (-1.57%)	⬇️
...e/period_closing_voucher/period_closing_voucher.py	88.05% <0.00%> (-1.50%)	⬇️
... and 15 more