Update Daisy clock to add battery estimate in hs

[Poolitzer]

Hi, I saw https://forum.espruino.com/conversations/395838/ and I wanted to implement it on my favorite clock. So I did.

Maybe @hughbarney has a review comment it being your app?

I decided not to check the firmware version when toggling the setting, this could be added if wanted (it being off by default I don't think people enable it if they aren't on the most recent version, or that those people couldn't find out the issue then :D)

Edit: After running around with this I realized that the big hour estimate is really not something I want to convert in my head, so I changed it now that it shows days instead. As soon as we get in the lower region the actual estimate jumps really noticeably, I am unsure if I should "catch" this here and probably just not display them, or if the function should return a more linear estimate. And tbh I personally dont mind the jumping numbers

[bobrippling]

LGTM, we'll give @hughbarney a day or so more then I'll merge

[bobrippling]

Thanks for the change! If you're interested, I have a similar change in #3477 for a widget too

[thyttan]

There's a bug making the app code and settings code default to different things: https://github.com/espruino/BangleApps/issues/3493#issuecomment-2211828151