When randomizing, hat overrides locked hair style

[dumbmatter]

If you go to https://zengm.com/facesjs/editor/, lock the hair style feature, and click the "randomize" button at the top, it works until you randomly get a baseball hat. Then it changes to another hair style.

Possibly there are other similar bugs with other features that override other features.

[tomkennedy22]

I think this is a bit by design w/ how hats override hairstyle - I think around this line of code: https://github.com/zengm-games/facesjs/blob/master/src/display.ts#L114

BUT, if it would make more sense for hats to not generate if hair is locked, we can probably add a special case into shuffleFace: https://github.com/zengm-games/facesjs/blob/master/public/editor/shuffleFace.ts