tests/network/probes: drop inexplicable dash
tests/network/probes: drop inexplicable dash

Avoid

[fedora@vmi-fedora ~]$ sudo systemctl stop qemu-guest-agent -
Failed to stop -.service: Unit -.service not loaded.
[fedora@vmi-fedora ~]$ echo $?
5

Signed-off-by: Dan Kenigsberg <184831158ae7531bcabc22617ed51e8717c81e93@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt