For #12531: Align Settings -> Private browsing to 72dp keyline

[person808]

Approved in #12536. Running CI

[codecov-commenter]

Codecov Report

Merging #12654 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #12654      +/-   ##
============================================
- Coverage     23.66%   23.61%   -0.06%     
  Complexity      798      798              
============================================
  Files           377      377              
  Lines         15478    15478              
  Branches       2020     2020              
============================================
- Hits           3663     3655       -8     
- Misses        11507    11515       +8     
  Partials        308      308              

Impacted Files	Coverage Δ	Complexity Δ
...mponents/searchengine/FenixSearchEngineProvider.kt	58.55% <0.00%> (-4.51%)	14.00% <0.00%> (ø%)
...nix/components/toolbar/BrowserToolbarController.kt	67.26% <0.00%> (-2.39%)	0.00% <0.00%> (ø%)
.../fenix/browser/browsingmode/BrowsingModeManager.kt	100.00% <0.00%> (+14.28%)	0.00% <0.00%> (ø%)

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