test_fs: reformat with ruff

Reformat the file with ruff.

Signed-off-by: Christopher Obbard <christopher.obbard@linaro.org>

Author: obbardc

test/test_fs.py

@@ -74,9 +74,7 @@ def _mount_fs(tmpdir, fs_class):
     mp = get_mp()
     with mp.Manager() as mgr:
         cross_process = mgr.Namespace()
-        mount_process = mp.Process(
-            target=run_fs, args=(mnt_dir, cross_process, fs_class)
-        )
+        mount_process = mp.Process(target=run_fs, args=(mnt_dir, cross_process, fs_class))
 
         mount_process.start()
         try: