Update salary_slip.js (#15200)

diff --git a/erpnext/hr/doctype/salary_slip/salary_slip.js b/erpnext/hr/doctype/salary_slip/salary_slip.js
index cec5356..afb7f1a 100644
--- a/erpnext/hr/doctype/salary_slip/salary_slip.js
+++ b/erpnext/hr/doctype/salary_slip/salary_slip.js
@@ -126,7 +126,6 @@
 }
 
 cur_frm.cscript.employee = function(doc,dt,dn){
-	doc.salary_structure = ''
 	get_emp_and_leave_details(doc, dt, dn);
 }
 
@@ -249,4 +248,4 @@
 		frm.refresh_field('gross_pay');
 		calculate_net_pay(frm.doc, dt, dn);
 	});
-}
\ No newline at end of file
+}