Crash when switching to an unsupported gamelist view style

[cmitu]

This was reported some time ago after the 2.8.0 release in https://retropie.org.uk/forum/topic/21216/update-to-4-4-7-no-more-pictures-in-es/13. Basically, when switching the Gamelist view style to Grid, ES will crash when the current used theme doesn't support this view style. Crash is avoided only if both theme and view style are changed at once (before exiting the menu).

I'm logging this so it doesn't get lost - ideally ES would warn the user when exiting the menu and maybe switch back to previous UI settings for theme and gamelist view style so a crash doesn't occur.