[bisq-network/bisq] Font is too small on 2K or 4K laptop displays on Linux (#4541)

[bubersson]

Nice, applying that approach worked with small modification! Thank you!

`DEFAULT_JVM_OPTS` didn't work, but this command works to execute Bisq with the right zoom from the commandline:
```shell
JAVA_TOOL_OPTIONS="-Dglass.gtk.uiScale=1.4 -XX:MaxRAM=4g" /opt/Bisq/Bisq
```

### Short Tutorial
To make this work from the dock (clicking on icon) I had to create `/opt/Bisq/Bisq-runner.sh` with
```shell
#!/bin/bash
JAVA_TOOL_OPTIONS="-Dglass.gtk.uiScale=1.4 -XX:MaxRAM=4g" /opt/Bisq/Bisq
```
Make it executable `chmod +x /opt/Bisq/Bisq-runner.sh`.
And  then update `/opt/Bisq/Bisq.desktop` and/or `/usr/share/applications/Bisq.desktop` to 
```
...
Exec=/opt/Bisq/Bisq-runner.sh
```

(I had to create the runner, because the .desktop spec doesn't seem to allow variable setting: https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-1.0.html)



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