[bisq-network/bisq] Fix using /bin/sh instead of /bin/bash in journalscraper.sh (#4054)

[wiz]

Fixes error @freimair 
```
Mar 12 13:43:19 gztmprecgqjq64zh collectd[1218]: exec plugin: exec_read_one: error = /journalreader/scraperscript.sh: 14: /journalreader/scraperscript.sh: Bad substitution
```
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4054

-- Commit Summary --

  * Fix using /bin/sh instead of /bin/bash in journalscraper.sh

-- File Changes --

    M pricenode/journalscraper.sh (2)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4054.patch
https://github.com/bisq-network/bisq/pull/4054.diff

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