OO-4034: use parameter signing for ADFS like in Scribe 1

src/main/java/org/olat/login/oauth/spi/ADFSApi.java

@@ -102,6 +102,16 @@ public class ADFSApi extends DefaultApi20 {
             this.api = api;
         }
 
+		@Override
+		public void signRequest(OAuth2AccessToken accessToken, OAuthRequest request) {
+			signRequest(accessToken.getAccessToken(), request);
+		}
+
+		@Override
+		public void signRequest(String accessToken, OAuthRequest request) {
+		    request.addQuerystringParameter(OAuthConstants.ACCESS_TOKEN, accessToken);
+		}
+
 		@Override
 		public OAuth2AccessToken getAccessToken(String code)
 		throws InterruptedException, ExecutionException, IOException {