fix: wrong compute of CTC on salary slip, if employee relieving date …

…before end of payroll period. (backport #1779) (#2054)

(cherry picked from commit 4c961fb)

Co-authored-by: Kitti U. @ Ecosoft <kittiu@gmail.com>

hrms/payroll/doctype/payroll_period/payroll_period.py

@@ -122,8 +122,6 @@ def get_period_factor(
 
 	if relieving_date and getdate(relieving_date) < getdate(period_end):
 		period_end = relieving_date
-		if month_diff(period_end, start_date) > 1:
-			start_date = add_months(start_date, -(month_diff(period_end, start_date) + 1))
 
 	total_sub_periods, remaining_sub_periods = 0.0, 0.0