[bisq-network/bisq] UX Issue: Support->Mediation buttons are grey on Closed state, but still clickable (#3729)

[Julian Knutsen]

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### Description

When going back to view a "Closed" mediation issue, the text and buttons are grey as if they are disabled, but clicking on "SELECT" and "DETAILS" still creates actions.

#### Version

c2e8806d1

### Steps to reproduce

1. Create localnet and take a trade through mediation process.
2. Go to Support->Mediation and try to see details from the result

### Expected behaviour

As a user, I would like to know that DETAILS is clickable so that I can view the trade details. SELECT is also useful since it allows me to view the chat log.

### Actual behaviour

SELECT and DETAILS are greyed out so it looks like I can't click them to get information about my previously mediated trade.

### Screenshots

![closed_mediations_clickable](https://user-images.githubusercontent.com/8082291/70007453-3d9e9e00-1525-11ea-8c99-c4dee96c1a2d.JPG)

#### Device or machine

Ubuntu 19.10

#### Additional info

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


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https://github.com/bisq-network/bisq/issues/3729
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