fix: Salary Slip & Expense Claim fixes

[ruchamahabal]

Front port for:
frappe/erpnext#31724
frappe/erpnext#31696
frappe/erpnext#31711

[codecov-commenter]

Codecov Report

Merging #26 (b6f845a) into develop (5e67388) will decrease coverage by 0.03%.
The diff coverage is 78.57%.

@@             Coverage Diff             @@
##           develop      #26      +/-   ##
===========================================
- Coverage    71.85%   71.81%   -0.04%     
===========================================
  Files          174      174              
  Lines         8641     8651      +10     
===========================================
+ Hits          6209     6213       +4     
- Misses        2432     2438       +6     

Impacted Files	Coverage Δ
hrms/payroll/doctype/salary_slip/salary_slip.py	87.01% <75.00%> (-0.57%)	⬇️
...yroll/doctype/salary_structure/salary_structure.py	85.53% <75.00%> (-0.56%)	⬇️
hrms/hr/doctype/expense_claim/expense_claim.py	84.07% <100.00%> (+0.37%)	⬆️