Fix the getLoginStatus return in Android platform

Reference: https://github.com/phonegap/phonegap-facebook-plugin/issues/467

The follow commit changed the result of the getLoginStatus method:
2f44977#diff-c25cdc153106f171cfa0c5fc8fdc1ffdL205

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Update:

The method getResponse(), from ConnectPlugin.java , was setting the userId to null. I made some changes in the class that let it works.