selftests/hid: fix bpf_wq new API

Since commit f56f4d54 ("bpf: helpers: fix bpf_wq_set_callback_impl
signature"), the API for bpf_wq changed a bit.

We need to update the selftests/hid code to reflect that or the
bpf program will not load.

Link: https://patch.msgid.link/20240723-fix-6-11-bpf-v1-1-b9d770346784@kernel.org


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