For #5371: Updates search engine settings string

[sblatz]

Pull Request checklist

• Quality: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)

• Tests: This PR includes thorough tests or an explanation of why it does not
  No tests needed, just a small pref/string change

• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not

• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features

After merge

• Milestone: Make sure issues finished by this pull request are added to the milestone of the version currently in development.

To download an APK when reviewing a PR:

1. click on Show All Checks,
2. click Details next to "Taskcluster (pull_request)" after it appears and then finishes with a green checkmark,
3. click on the "Fenix - assemble" task, then click "Run Artifacts".
4. the APK links should be on the left side of the screen, named for each CPU architecture

[codecov-io]

Codecov Report

Merging #5393 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #5393      +/-   ##
============================================
+ Coverage     12.57%   12.57%   +<.01%     
  Complexity      260      260              
============================================
  Files           248      248              
  Lines         10289    10288       -1     
  Branches       1515     1517       +2     
============================================
  Hits           1294     1294              
+ Misses         8908     8907       -1     
  Partials         87       87

Impacted Files	Coverage Δ	Complexity Δ
...ava/org/mozilla/fenix/settings/SettingsFragment.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
...org/mozilla/fenix/settings/SearchEngineFragment.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
...n/java/org/mozilla/fenix/IntentReceiverActivity.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️

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