[bisq-network/bisq] Error message when creating a proposal to change the BTC maker below dust limit needs better messaging (#3741)

[Julian Knutsen]

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### Description

<!-- brief description of the bug -->
Error message when creating a proposal to change the BTC maker fee needs units.

#### Version

<!-- commit id or version number -->
5880ad99c
### Steps to reproduce

<!--if you can reliably reproduce the bug, list the steps here  -->
1. Go to Governance->Make Proposal->Proposal For Changing a parameter
2. Select BTC maker fee
3. input 0
4. see error message

### Expected behaviour

<!--description of the expected behavior -->
Value in label (BTC) matches value in error

### Actual behaviour

<!-- explain what happened instead of the expected behaviour -->
Value in label (.0010 BTC) does not match 546 (BSQ?)

### Screenshots

<!--Screenshots if gui related, drag and drop to add to the issue -->
![546_no_units](https://user-images.githubusercontent.com/8082291/70095685-40a79600-15da-11ea-8cfa-f0715288a510.JPG)

#### Device or machine

<!-- device/machine used, operating system -->
Ubuntu 19.10


#### Additional info

<!-- Additional information useful for debugging (e.g. logs) -->


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https://github.com/bisq-network/bisq/issues/3741
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