fixed typo

fixes type in filter parameter
diff --git a/erpnext/hr/doctype/leave_application/leave_application.py b/erpnext/hr/doctype/leave_application/leave_application.py
index 737f602..5e71c00 100755
--- a/erpnext/hr/doctype/leave_application/leave_application.py
+++ b/erpnext/hr/doctype/leave_application/leave_application.py
@@ -125,7 +125,7 @@
 				status = "Half Day" if date == self.half_day_date else "On Leave"
 
 				attendance_name = frappe.db.exists('Attendance', dict(employee = self.employee,
-					attenance_date = date, docstatus = ('!=', 2)))
+					attendance_date = date, docstatus = ('!=', 2)))
 
 				if attendance_name:
 					# update existing attendance, change absent to on leave