[bisq-network/bisq] Size popup proportional to amount of text shown (#5424)

[jmacxx]

This is a followup to #5399 which cleans up a minor display issue.

CashByMail terms are defined by the offer maker, some users have only 1 line of text, others have a lengthy contract.
For the cases where only 1 line is shown, the large popup taking the whole screen looks a bit ridiculous, so here we vertically size the popup proportional to the number of lines in the message (with limits to not be < 20% or > 70% of allowable height).

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Here are some example screenshots comparing the results with lots of text, and just one line.

![image](https://user-images.githubusercontent.com/47253594/115471174-28e7a680-a1fd-11eb-9343-eb87742c8a03.png)


![image](https://user-images.githubusercontent.com/47253594/115471133-1b322100-a1fd-11eb-94cf-5645553b3ed8.png)

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/5424

-- Commit Summary --

  * Size GenericMessageWindow proportional to amount of text shown

-- File Changes --

    M desktop/src/main/java/bisq/desktop/main/overlays/windows/GenericMessageWindow.java (12)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5424.patch
https://github.com/bisq-network/bisq/pull/5424.diff

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