Balance screen: Flickering loading indicator in Wallet Header

[myxmaster]

Describe your enhancement idea

The loading indicator which is displayed in Wallet Header when you are on Balance screen has similar issues like what I fixed here for Activity screen: 6b98124

It is enabled/disabled multiple times, which leads to the effect that the loading indicator is sometimes not visible although it is still loading (when the fiat balance changes, that is a clear indicator that stuff was still loading e.g.).

-> I didn't analyze in detail yet, but we probably need to set the loading state in a higher-level component.