Screen ghosting after welcome screen

Thanks - do you notice it anywhere else?

I'm wondering what we do in https://github.com/espruino/BangleApps/blob/master/apps/welcome/app-bangle2.js that makes it so apparent in the welcome app.

I'll do some testing with:

Bangle.setLCDTimeout(0);
Bangle.setLocked(0);
Bangle.setLCDPower(1);

As I think that may be causing the problem...