tests: Fix the download test

Weekly tests were failing: https://jenkins.gem5.org/job/weekly/56

This was due to the test passing the wrong parameter to the script.

Change-Id: Ief810d6b39859129a95fe8a2914e47d21bf879aa
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/60410
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
(cherry picked from commit f4f40f44f1)
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/61731

tests/gem5/gem5-resources/test_download_resources.py

@@ -40,7 +40,7 @@ gem5_verify_config(
     config=joinpath(
         config.base_dir, "tests", "gem5", "configs", "download_check.py"
     ),
-    config_args=["--resource-directory", resource_path],
+    config_args=["--download-directory", resource_path],
     valid_isas=(constants.null_tag,),
     length=constants.very_long_tag,
 )