event-test.py: Remove extra ( in --help output
event-test.py: Remove extra ( in --help output

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

libvirt/libvirt-python,libvirt/libvirt-python,libvirt/libvirt-python