Fix the getLoginStatus return in Android platform

Issue: https://github.com/phonegap/phonegap-facebook-plugin/issues/467

Description:
The follow commit changed the result of the getLoginStatus method:
https://github.com/phonegap/phonegap-facebook-plugin/commit/2f44977

After my modification, the method getResponse(), from ConnectPlugin.java , was setting the userId to null. I made some changes in the class that let it works.