systemc: Get rid of --working-dir in the test's config.py.

This option is no longer used and isn't needed.

Change-Id: Iec1e2799b4f8c9ea258614323d55941b55828d27
Reviewed-on: https://gem5-review.googlesource.com/c/16565
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>
1 file changed