Change the stated dimensions of the TU Wien logo

* we just deployed the image in a 100x100 px resolution, because
  1000x1000 px was a bit large

config/saml2-backend.yaml

@@ -68,8 +68,8 @@ config:
               text: ["TU Wien", "Research Data"]
           logo:
             text: "https://researchdata.tuwien.ac.at/static/images/tu-wien-logo.png"
-            width: "1000"
-            height: "1000"
+            width: "100"
+            height: "100"
         authn_requests_signed: false
         want_response_signed: false
         allow_unsolicited: true