Fix: Get/save TippingPoint TLS workaround correctly

The alert dialog now uses the correct field for TLS workaround option
of the TippingPoint SMS method.

Previously the wrong field was used, so the dialog did not work
correctly.

src/web/pages/alerts/component.js

@@ -596,7 +596,7 @@ class AlertComponent extends React.Component {
               '',
             ),
             method_data_tp_sms_tls_workaround: parseYesNo(
-              getValue(method.data.tp_sms_hostname, NO_VALUE),
+              getValue(method.data.tp_sms_tls_workaround, NO_VALUE),
             ),
 
             method_data_verinice_server_report_format: