[bisq-network/bisq] Limit MaxRAM for all java apps (#4186)

[Stan]

> Is there some kind of conclusion to what we should do here?

My 2 sats:  I think the riskiest aspect of this change was adding the `MaxRAM` setting to `bisq-desktop`.  Since being tried out by devs and end users of the released change:
* Chris reported 1 `:desktop` OOME some months ago.
* I saw one after running a `:desktop` instance for a ~week on a 10+ year old 8 Gb Dell server.  My OOME happened while resident memory was still < 2 Gb, so I can't be sure it was due to the 4g MaxRAM setting.

That's 2 OOMEs that I know of being reported since the change has been in use by Linux/OSX devs and users, and not enough to warrant backing out the prior `MaxRAM` setting in `:desktop`.

My conclusion for this PR:  JavaFX's appetite is why the change was needed, so I'm now in favor of letting this PR go stale unless others want to see it merged.

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