fixup! TB3: Tor Browser's official .mozconfigs.

Bug 41567: Do not customize MOZ_APP_BASENAME in Tor Browser.

That variable renames a lot of "firefox"es to "torbrowser".
It could be desirable, but it will break a lot of legacy, including
links generated with the Windows installer.

browser/config/mozconfigs/tor-browser

 . $topsrcdir/browser/config/mozconfigs/base-browser
 
-export MOZ_APP_BASENAME="TorBrowser"
 mk_add_options MOZ_APP_DISPLAYNAME="Tor Browser"
 
 ac_add_options --with-relative-data-dir=TorBrowser/Data/Browser