Bug 40562: Added Tor Browser preferences to 000-tor-browser.js

Before reordering patches, we used to keep the Tor-related patches
(torbutton and tor-launcher) at the beginning.
After that issue, we decided to move them towards the end.

In addition to that, we have decided to move Tor Browser-only
preferences there, too, to make Base Browser-only fixups easier to
apply.