prepare.hostapd_wireless: unset transition SSID
Even though SSID is set as hidden (no_broadcast), it is set in roughly 50% of the cases, which makes GUI tests fail, because they expect it to be unset for hidden SSID.
https://issues.redhat.com/browse/RHEL-23213
@RunFeatures:wifi_hwsim,nmtui_wifi_hwsim
Edited by Filip Pokryvka