feature: show more digits for VTHO

[openPhiL]

using the windows app, I see that I have VET and VTHO. i "hope" that just holding VET increases VTHO - as it does on the exodus wallet. But in the exodus wallet, I can actually see a change every 10sec, because it has like 8 digits.. where here in the app, you only show 2. I have to wait until next week to see this changing.

I think it would be better if VTHO would have more digits, like 6 or so.