[lcars] Wind speed option only works if locale is kph

### Affected hardware version

Bangle 2

### Your firmware version

2v27.45

### The bug

_Very, very low priority--just noting in case anyone wants to tackle it._

Selecting kph vs mph in the settings only works if your locale is in kph. If your locale is already in mph, you end up with mph divided by ~1.6

Workaround is just leave the setting as "kph" and it'll show your locale's speed.

A fix might be just a note in the readme, or have code check if the locale is kph vs other?

https://github.com/espruino/BangleApps/blob/17787eececc0af9aa629061ac05d87e23ea785db/apps/lcars/lcars.app.js#L686-L689

### Installed apps

_No response_