[bisq-network/bisq] [REGEST] Mediator doesn't have BTC to exercise refund test cases (#3738)

[Julian Knutsen]

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### Description

<!-- brief description of the bug -->
The default regtest mediator does not have sufficient starting BTC to pay out refund agent decisions.

#### Version

5880ad99c

### Steps to reproduce

1. Start localnet cluster
2. Run `Mediation/Support Process 0018`
3. Decline request from Bob
4. Enter RefundAgent stage
5. Rule on BTC to buyer
6. Receive error

<!--if you can reliably reproduce the bug, list the steps here  -->

### Expected behaviour

Test cases can be run with default nodes

### Actual behaviour

<!-- explain what happened instead of the expected behaviour -->
A mediator can not pay out decisions due to lack of funds.

### Screenshots

<!--Screenshots if gui related, drag and drop to add to the issue -->
![insufficient_money_exception](https://user-images.githubusercontent.com/8082291/70081122-c6b4e400-15bc-11ea-9c8f-5c1e1dac73da.JPG)



#### Device or machine

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


#### Additional info





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https://github.com/bisq-network/bisq/issues/3738
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