feat(minor): allow using rounded function in salary slip formulae (backport #1774) (#1775)

- the `round` function does Banker's rounding. Allow usage of `rounded` to respect System Settings & allow Commercial Rounding

(cherry picked from commit c1704c9)

Co-authored-by: Rucha Mahabal <[email protected]>

Author: mergify[bot]

hrms/payroll/doctype/salary_slip/salary_slip.py

@@ -64,6 +64,7 @@ def __init__(self, *args, **kwargs):
 			"float": float,
 			"long": int,
 			"round": round,
+			"rounded": rounded,
 			"date": date,
 			"getdate": getdate,
 			"ceil": ceil,