For #20919 quit the app after removing a study. (backport #20933)

[mergify]

This is an automatic backport of pull request #20933 done by Mergify.
Cherry-pick of d301998 has failed:

On branch mergify/bp/releases_v92.0.0/pr-20933
Your branch is up to date with 'origin/releases_v92.0.0'.

You are currently cherry-picking commit d3019986a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   app/src/main/java/org/mozilla/fenix/settings/studies/StudiesAdapter.kt
	deleted by us:   app/src/main/java/org/mozilla/fenix/settings/studies/StudiesInteractor.kt
	both modified:   app/src/main/res/values/strings.xml
	deleted by us:   app/src/test/java/org/mozilla/fenix/settings/studies/DefaultStudiesInteractorTest.kt
	deleted by us:   app/src/test/java/org/mozilla/fenix/settings/studies/StudiesAdapterTest.kt

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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