[FixaMinGata] Hide app badges when using PWABuilder

[jonkri]

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The app-platform cookie comes from the PWABuilder code:

$ grep -Inr app-platform
./src/FixaMinGata/Settings.swift:22:let platformCookie = Cookie(name: "app-platform", value: "iOS App Store")

It has worked okay for us. The app icons are visible outside of the iOS app but hidden inside the iOS app.

Apple rejected the app until we made that change.

Related to #4153.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.44%. Comparing base (13d30dc) to head (3ed1e1e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5311      +/-   ##
==========================================
+ Coverage   82.43%   82.44%   +0.01%     
==========================================
  Files         416      416              
  Lines       32894    32890       -4     
  Branches     5281     5281              
==========================================
+ Hits        27116    27117       +1     
+ Misses       4220     4215       -5     
  Partials     1558     1558              

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