Rename 'iOS on iPad' to 'iPadOS'
Rename 'iOS on iPad' to 'iPadOS'

Closes #2210

Change-Id: I695d2ee1c66be2a58c55272bb96feb225ca7b257

tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player