fix: UX improvement. move trigger on fieldname restrict_backdated_leave_application (#20211)

diff --git a/erpnext/hr/doctype/hr_settings/hr_settings.js b/erpnext/hr/doctype/hr_settings/hr_settings.js
index 2e8c99f..b629b42 100644
--- a/erpnext/hr/doctype/hr_settings/hr_settings.js
+++ b/erpnext/hr/doctype/hr_settings/hr_settings.js
@@ -2,10 +2,6 @@
 // For license information, please see license.txt
 
 frappe.ui.form.on('HR Settings', {
-	refresh: function(frm) {
-
-	},
-
 	encrypt_salary_slips_in_emails: function(frm) {
 		let encrypt_state = frm.doc.encrypt_salary_slips_in_emails;
 		frm.set_df_property('password_policy', 'reqd', encrypt_state);
@@ -19,6 +15,9 @@
 			}
 			frm.set_value('password_policy', policy.split(new RegExp(" |-", 'g')).filter((token) => token).join('-'));
 		}
+	},
+
+	restrict_backdated_leave_application: function(frm) {
 		frm.toggle_reqd("role_allowed_to_create_backdated_leave_application", frm.doc.restrict_backdated_leave_application);
 	}
 });
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