[bisq-network/bisq] Accept/Reject mediators suggestion UI popup loop during arbitration wait period (#3737)

[Julian Knutsen]

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### Description

<!-- brief description of the bug -->

#### Version

5880ad99c

### Steps to reproduce

1. Start localnet cluster
2. Run `Mediation/Support Process 0018`
3. Decline request from Bob
4. Receiver error that Bob needs to wait for X blocks before opening an arbitration dispute
5. Close popup
6. Click Funds, then back to Portfolio
7. Asked to accept/reject the mediators suggestion
8. Click reject
9. Receive error about needing to wait X blocks
10. Loop...

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

### Expected behaviour

If I didn't try to request arbitration again, a popup shouldn't be displayed

### Actual behaviour

<!-- explain what happened instead of the expected behaviour -->
When going back to 'Funds' to look at another trade, I am met with a popup about an action I didn't take (because I am waiting for X blocks).


### Screenshots

<!--Screenshots if gui related, drag and drop to add to the issue -->
![decline_mediation_not_allowed_ui_loop](https://user-images.githubusercontent.com/8082291/70080299-24e0c780-15bb-11ea-8202-fcc303ae0b8d.JPG)

![decline_mediation_not_allowed_ui_loop2](https://user-images.githubusercontent.com/8082291/70080512-886af500-15bb-11ea-8589-eed4f37f1aa7.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/3737
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