[bisq-network/bisq] Display total fee estimate when choosing to fund trade with BTC or BSQ (#5327)

[phinneaus]

### Description

When issuing a maker offer, user is presented with the option of funding the transaction with either BTC or BSQ.   BSQ appears to be significantly cheaper, but this does not take into account that there is an extra input / output to the transaction, resulting in mining fees that can be 80%+ higher.

Suggest displaying the total estimated cost (trade fee + mining fee estimate) when selecting between BTC and BSQ.

![paste](https://user-images.githubusercontent.com/79758657/111654584-e33b5680-87d6-11eb-98b6-4bee3e1b1e17.png)


#### Version

1.5.9

### Steps to reproduce

1. Create offer to buy
2. Observe trade fee currency options between BTC and BSQ

### Expected behaviour

In addition to trade fee, show mining fee so user can evaluate total cost of trade before committing.

### Actual behaviour

Trade fee alone is displayed on the initial create offer screen, estimated mining fee is not shown until the next step for committing the offer.


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https://github.com/bisq-network/bisq/issues/5327
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