[bisq-network/bisq] Fix offer editing for low volume offers (#2929)

[sqrrm]

Open offer as:
![image](https://user-images.githubusercontent.com/23560607/60515590-36583780-9cdc-11e9-8cef-1583a8ef2f1a.png)
edit usd offer:
![image](https://user-images.githubusercontent.com/23560607/60515611-4a039e00-9cdc-11e9-9638-366a6bbe40fc.png)
edit alt coin offer:
![image](https://user-images.githubusercontent.com/23560607/60515651-61db2200-9cdc-11e9-8662-b8a5dced5602.png)

Attaching log but I don't think it's very interesting
[issue_2929.log](https://github.com/bisq-network/bisq/files/3350244/issue_2929.log)

Looks like the amount defaults to 1 BTC after editing. It might not be related to your fix though.


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