Disable third-party tracking frameworks Adjust and Leanplum in mobile Tor Browser

It seems Mozilla has outsourced gathering analytics about mobile browser usage to a bunch of people. We should make sure this is disabled in Tor Browser. See:

https://support.mozilla.org/en-US/kb/send-usage-data-firefox-mobile-devices https://firefox-source-docs.mozilla.org/mobile/android/fennec/mma.html