selftests/hid: run ruff format on the python part

We aim at syncing with the hid-tools repo on
gitlab.freedesktop.org/libevdev/hid-tools. One of the commits is this
mechanical formatting, so pull it over here so changes are not hidden by
those.

Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Link: https://patch.msgid.link/20250709-wip-fix-ci-v1-1-b7df4c271cf8@kernel.org


Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>