UC-30,UC-31 Remove the facebook sync buttons from the user pref page

For the FB connect upgrade.

https://wikia-inc.atlassian.net/browse/UC-30
https://wikia-inc.atlassian.net/browse/UC-31
Also, FYI, I fixed the code that was blindly adding a '?' to the end of a URL without checking if it already had one:

https://github.com/Wikia/app/pull/5279/files#diff-757fe68aeed0f54299598495ffce41a0R574