meta-balena-dunfell:os-extra-firmware: Make the systemd service ExecS…

[floion]

…tart the script directly

Explicitly calling the sh interpreter makes the service fail on Dunfell based devices.

Change-type: patch

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• Changes have been tested
  • Covered in automated test suite
  • Manual test case recorded
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[flowzone-app]

Website deployed to CF Pages, 👀 preview link https://e25e92bc.balena-os.pages.dev

[acostach]

LGTM

[mtoman]

/rebase