improving authorization script

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.web/src/main/resources/en/scripts/authorization.js

@@ -84,4 +84,7 @@ function backendAutorization(){
     }).then(handleResponse);
 }
 
+document.addEventListener("logged_in", function(event) { // wait until page loaded
     backendAutorization();
+});
+