finddir: Add SYSTEM_DESKBAR_DIRECTORY

* Resolves #18883

Change-Id: Ib971272319d55b37fa06d6874f257c8080bdab8f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7611
Reviewed-by: waddlesplash <waddl

finddir: Add SYSTEM_DESKBAR_DIRECTORY

* Resolves #18883

Change-Id: Ib971272319d55b37fa06d6874f257c8080bdab8f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7611
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: nephele nephele <nep-git@packageloss.eu>
Reviewed-by: Alexander von Gluck <alex@terarocket.io>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

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