Revert "Use sig-test.tugraz.at in dev"

This reverts commit 4fc68fce.

rollup.config.js

@@ -60,7 +60,6 @@ switch (build) {
     keyCloakServer = 'auth-dev.tugraz.at';
     keyCloakBaseURL = 'https://' + keyCloakServer + '/auth';
     keyCloakClientId = 'auth-dev-mw-frontend';
-    pdfAsQualifiedlySigningServer = 'sig-test.tugraz.at'
     break;
   case 'demo':
     basePath = '/apps/signature/';