Fixes Compatibility message for iOS users

[championshuttler]

Fixes mozilla/addons#14047

[codecov-io]

Codecov Report

Merging #10276 (0245d5a) into master (fbf2fa4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   mozilla/addons-frontend#10276   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files         248      248           
  Lines        7337     7337           
  Branches     1340     1340           
=======================================
  Hits         7218     7218           
  Misses        111      111           
  Partials        8        8           

Impacted Files	Coverage Δ
src/amo/components/WrongPlatformWarning/index.js	100.00% <ø> (ø)

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[willdurand]

thanks