[2] Allow "single" change of Fee asset on TX

[startailcoon]

My own opinion is that it would be nice to have a "change fee asset directly" when yo do a transaction, that doesn't stick to be the default, but just for that one op. But that's for a followup issue I think.

Originally posted by @startailcoon in #1117 (comment)

With the new Fee selection component we can now let the user select the default fee asset in a nice view. At the moment we have not enabled this feature directly on the Transaction confirmation itself, which would be a nice addition.

Related are #1498

[OpenLedgerApp]

@startailcoon I can take this one.

[startailcoon]

Assigned you @OpenLedgerApp

[sschiessl-bcp]

The task at hand is to allow that the user to change the fee at hand directly in the TransactionConfirm modal. It should be minimal inversive. Currently there is only a "?" icon with a tooltip. We want a new icon (or replacement) next to it (e.g. the change icon) that will on-click make the fee asset selectable. This does not require any fee calculation overhead since the BTS fee is fixed and merely has to be converted using the CER, and it should not persist the fee asset selection to settings.

[startailcoon]

[...] would be nice to have a "change fee asset directly" when yo do a transaction, that doesn't stick to be the default [...] let the user select the default fee asset in a nice view. At the moment we have not enabled this feature directly [...]

I thought I was clear in my comment on the original post. The linked issue would have given more details on the subject as well.

[startailcoon]

@OpenLedgerApp what is your status on this issue, where you clear on what the end result was supposed to be with the latest comments? Otherwise, please post any required clarifications here.