For #19113 - Change topSite corner radius to 8dp

[codrut-topliceanu]

Fixes #19113

Pull Request checklist

• Tests: This PR includes no tests as it is only a minor change.
• Screenshots: This PR includes screenshots.
• Accessibility: The code in this PR follows accessibility best practices.

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[gabrielluong]

Thanks! This looks good to me. Let's wait for @brampitoyo's UX review before landing.

[brampitoyo]

r+!

[codecov-commenter]

Codecov Report

Merging #19262 (6e14deb) into master (4ee8f15) will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #19262      +/-   ##
============================================
+ Coverage     34.62%   34.67%   +0.05%     
- Complexity     1614     1615       +1     
============================================
  Files           540      540              
  Lines         21819    21784      -35     
  Branches       3251     3245       -6     
============================================
- Hits           7554     7553       -1     
+ Misses        13367    13335      -32     
+ Partials        898      896       -2     

Impacted Files	Coverage Δ	Complexity Δ
...rg/mozilla/fenix/settings/account/AccountUiView.kt	36.58% <0.00%> (+2.43%)	4.00% <0.00%> (ø%)
...a/org/mozilla/gecko/search/SearchWidgetProvider.kt	32.50% <0.00%> (+8.50%)	1.00% <0.00%> (ø%)
...java/org/mozilla/fenix/perf/PerformanceInflater.kt	95.00% <0.00%> (+15.00%)	5.00% <0.00%> (+1.00%)

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