[bisq-network/bisq] [v1.6.5] Handle send amounts below dust more gracefully (#5532)

[Christoph Atteneder]

### Description

We shouldn't get to the point showing a IllegalArgumentException when an amount below the dust limit is entered. 

#### Version

v1.6.5

### Steps to reproduce

Send funds from wallet and try to send an amount below dust limit 

### Expected behaviour

An validation error is displayed and `Withdraw selected` can't be pressed.

### Actual behaviour

Withraw selected can be triggered and an `java.lang.IllegalArgumentException: The amount is too low (dust limit).` is surfaced.

### Screenshots

![Bildschirmfoto 2021-05-26 um 11 01 20](https://user-images.githubusercontent.com/170962/119633897-7665bd80-be12-11eb-88b7-5171ce3d8434.png)



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https://github.com/bisq-network/bisq/issues/5532
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