[bisq-network/bisq] UI: In OfferBook, show tooltip on data point hover (#4228)

[Petr Hejna]

Just small UI glitch, nodes on the edges will not be fully visible: 
![image](https://user-images.githubusercontent.com/383295/81496030-e4495080-92b4-11ea-8969-11667d0abc4a.png)


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