The toggle for Johnny's Alternative Appearance can be found in game Settings in the Main Menu under the "Additional Content" tab. Please note that this option is only visible from the Main Menu and not in-game.
From the MAIN MENU (when you first start the game) go to settings, there will be a section marked Additional Content. There's only one item, Jonny's appearance, which you toggle between default, or the new one. Double check you have version 1.31
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Looks like you got it sorted while i was working on that reply