Toggle currency on banner click

[naezith]

Implements #331

[tonymorony]

upd: started fine after PC reboot

Endless "Loading" on my side (tried OSX dmg from this build https://github.com/KomodoPlatform/atomicDEX-Pro/actions/runs/162150984)
log: https://paste.ubuntu.com/p/q5NpNWBytv/

[tonymorony]

Looks good, however at the moment it works not as: selected Fiat / BTC / KMD but as USD / BTC / EUR / KMD

@naezith Please use only one fiat currency selected in Settings -> Fiat with only fiat currencies in that list:

[naezith]

@Milerius backend needs to change for this last request because those 4 are in get_available_fiats.

[tonymorony]

On startup ticker is Undefined atm, until I click the toggle

[22:04:59 +07:00] [I] [thr 13026] refreshing transactions
[22:04:59 +07:00] [D] [thr 13026] refresh_transactions l322
[22:04:59 +07:00] [W] [thr 13026] error when converting BTC to USD, err: You try to convert from an unknown ticker, are you trying to convert from a test-coin ?
[22:04:59 +07:00] [W] [thr 13026] error when converting KMD to USD, err: You try to convert from an unknown ticker, are you trying to convert from a test-coin ?
[22:04:59 +07:00] [W] [thr 13026] error when converting ZEC to USD, err: You try to convert from an unknown ticker, are you trying to convert from a test-coin ?

[naezith]

Front-end did not apply the back-end changes yet.

[naezith]

Should be fine now.