[riot-notifications] [RIOT-OS/RIOT] dist/tools/jlink: add -nogui to version test (#15441)

[Francisco]

### Contribution description

If multiple debuggers are present when testing for JLinkExe version
a GUI will open to select the debugger to attach, so add -nogui
when testing for version as well.


### Testing procedure

Attempt flashing with multiple jlink devices connected a gui will open. With this PR it does not.
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/15441

-- Commit Summary --

  * dist/tools/jlink: add -nogui to version test

-- File Changes --

    M dist/tools/jlink/jlink.sh (4)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15441.patch
https://github.com/RIOT-OS/RIOT/pull/15441.diff

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