Fix getAccessTokenAsJwt

Author: LEDfan

src/main/java/eu/openanalytics/containerproxy/auth/impl/OpenIDAuthenticationBackend.java

@@ -383,7 +383,7 @@ public String getAccessToken() {
 
         public Jwt getAccessTokenAsJwt() {
             try {
-                return accessTokenDecoder.decode("abc");
+                return accessTokenDecoder.decode(getAccessToken());
             } catch (JwtException e) {
                 log.warn("Failed to decode access token as JWT", e);
                 throw e;