7506 show highlight on home 3-dot button

[severinrudie]

Pull Request checklist

• Tests: This PR includes thorough tests or an explanation of why it does not
• 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

Screenshots

[NotWoods]

Tentative approval. We need to update AC first before merging this.

[severinrudie]

Tentative approval. We need to update AC first before merging this.

Specifically, we're waiting on mozilla-mobile/android-components#5620

[codecov-io]

Codecov Report

Merging #7665 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #7665      +/-   ##
============================================
+ Coverage     19.14%   19.15%   +<.01%     
  Complexity      451      451              
============================================
  Files           301      301              
  Lines         11666    11660       -6     
  Branches       1583     1581       -2     
============================================
  Hits           2234     2234              
+ Misses         9247     9241       -6     
  Partials        185      185

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/org/mozilla/fenix/home/HomeFragment.kt	0% <0%> (ø)	0 <0> (ø)	⬇️

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