[MOD-2239] Facebook: Ask GitHub to convert repository from fork to source

[~manuellehner] just told me GitHub's support helped him to convert https://github.com/manumaticx/Ti.DrawerLayout from a fork of https://github.com/Tripvi/Ti.DrawerLayout into a source. We should ask the same for https://github.com/appcelerator-modules/ti.facebook which is now listed as a fork of https://github.com/mokesmokes/titanium-android-facebook. Forks are not indexed by GitHub, which makes them indiscoverable, for example by gitTio.