[IMP] hr_attendance: remove entered PIN if wrong

So you don't have to click on Clear before re-entering the PIN.

addons/hr_attendance/static/src/js/kiosk_confirm.js

@@ -47,6 +47,7 @@ var KioskConfirm = Widget.extend({
                     self.do_action(result.action);
                 } else if (result.warning) {
                     self.do_warn(result.warning);
+                    self.$('.o_hr_attendance_PINbox').val('');
                     setTimeout( function() { self.$('.o_hr_attendance_pin_pad_button_ok').removeAttr("disabled"); }, 500);
                 }
             });