CrOS: Enforce ESLint eqeqeq checks in //c/b/r/c/crostini_upgrader

This change updates the
//chrome/browser/resources/chromeos/crostini_upgrader directory to use
strict equality checks.

This change was generated with:
 git ls-files 'components/*.js' | xargs grep -l -P ' [!=]= (?!null)' | xargs perl -p -i -e 's/ ([!=])= (?!null)/ \1== /g'
For more information on this command see
https://chromium-review.googlesource.com/c/chromium/src/+/2003638.

Bug: b/323585468
Change-Id: I4ee2e465a72122a5efb241e7e11985fe48a08e0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5278638
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Auto-Submit: Chad Duffin <chadduffin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1258126}