AppIcon and LaunchImage Updates

[erisu]

Platforms affected

ios

What does this PR do?

Updates the AppIcon and LaunchImage image sets by adding the missing image images and making the naming conventions consistent.

What testing has been done on this change?

• npm t
• Build default hello world app

[codecov-io]

Codecov Report

Merging #512 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #512   +/-   ##
=======================================
  Coverage   74.75%   74.75%           
=======================================
  Files          11       11           
  Lines        1822     1822           
=======================================
  Hits         1362     1362           
  Misses        460      460

Impacted Files	Coverage Δ
bin/templates/scripts/cordova/lib/prepare.js	83.89% <ø> (ø)	⬆️

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[dpogue]

👍