Fixes trust_level expression (mozilla-mobile#2373)

No Issue - Uses non-deprecated API to fetch version code (mozilla-mob…

…ile#2307)

Closes mozilla-mobile#146 & Closes mozilla-mobile#147: Integrates fin…

…d in page

Co-authored-by: Sawyer Blatz <sdblatz@gmail.com>

build.gradle: Add last digit for processor arch