Fix an incorrect SLF4J logger call

The format string had one too many formatting anchors.

This issue was found by SLF4J Helper for NetBeans IDE:
http://plugins.netbeans.org/plugin/72557/

genie-client/src/main/java/com/netflix/genie/client/security/oauth2/impl/OAuth2SecurityInterceptor.java

@@ -72,7 +72,7 @@ public Response intercept(
                 .addHeader(HttpHeaders.AUTHORIZATION, accessToken.getTokenType() + " " + accessToken.getAccessToken())
                 .build();
 
-            log.debug("Sending request {} on {} {} {}", newRequest.url(), chain.connection(), newRequest.headers());
+            log.debug("Sending request {} on {} {}", newRequest.url(), chain.connection(), newRequest.headers());
 
             return chain.proceed(newRequest);
     }