Bangle.js2: Cutting Edge firmware slow

Wow, thanks for tracking that down! And yes, I can confirm it's the same here too

I bet that destroys battery life as well. I've just put a fix in if you update the widget app now.

This actually exposed a few issues which I've now fixed:

• Bangle.isBarometerOn was broken in cutting edge builds, which is what caused this in the first place
  
• The widget needn't have been checking isBarometerOn though - so just removing the check fixed it
  
• The widget also kept adding handlers for the barometer data, so every 15 minutes it'd just use more and more memory and get slower and slower - so I've fixed that now too