[bisq-network/bisq] Add a placeholder on the "Search Disputes" field (#5105)

[Pedro Goncalves]

### Description

It would help inform the user what data point the field uses to look for open issues.
Currently this information is on a tooltip that only shows up after awhile and on hover.
#### Version

1.5.4

<img width="679" alt="Screen Shot 2021-01-22 at 11 07 29 AM" src="https://user-images.githubusercontent.com/807505/105564383-d9720700-5cef-11eb-9290-bfdea4b01ead.png">
<img width="466" alt="Screen Shot 2021-01-22 at 8 23 22 PM" src="https://user-images.githubusercontent.com/807505/105564385-da0a9d80-5cef-11eb-9d31-97ee52ed6764.png">


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