Updates in nightly build are not working after the switch to 78.0.1

The updates in the latest nightly builds are not working anymore. It seems the browser is trying to get the update xml from https://aus1.torproject.org/ instead of https://nightlies.tbb.torproject.org/.

In projects/firefox/build we are updating app.update.url in browser/app/profile/firefox.js. However it seems the app.update.url pref has been removed: https://bugzilla.mozilla.org/show_bug.cgi?id=1568994

Instead we need to update the URL in build/application.ini.in.

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