update iosGray color
update iosGray color

It's not used anywhere, so I can redefine it and not break anything.

This was taken from the iOS 11 Files app's search bar.

StoDevX/AAO-React-Native,StoDevX/AAO-React-Native,StoDevX/AAO-React-Native,StoDevX/AAO-React-Native,StoDevX/AAO-React-Native,StoDevX/AAO-React-Native,StoDevX/AAO-React-Native,StoDevX/AAO-React-Native,StoDevX/AAO-React-Native