[Improvement] Misleading printer efficiency statistics

[mggevaer]

Printer efficiency statistics doesn't care whether data is available for a certain time or not.
I connected my Mk3s a couple of days ago, but it will happily count the days before then as "other state".
This makes it difficult to ever get an idea of printer efficiency over the entire lifetime of the printer (at least while connected to prusa connect)
You can see the result below for 90 days, despite the printer having been active for about 70% of the time since I added prusa link.

I have connected up prusa-link once a long time ago. This could also be the cause why statistics let's me look back that far in time.