Add balance hiding for minifront

[Valentine1898]

Is your feature request related to a problem? Please describe.
Users and developers in mainnet may encounter different bugs and it would be useful for us to receive their reports and feedback. Bug reports often contain screenshots or screen recordings, it would be convenient to be able to hide balances in this case, so that users who give feedback do not risk their privacy.

Describe the solution you'd like
Add a button that will replace amounts with other symbols (e.g. emoji 🌘 🌘 🌘).