Fix wifi scan event "wifi.radio"

• The parameters name in the event data has been changed.

  current event: { "wifi.radio": {"ifname":"wl1","event":"scan_started"} } { "wifi.radio": {"ifname":"wl1","event":"scan_finished"} }

  older event: { "wifi.radio": {"radio":"wl1","action":"scan_started"} } { "wifi.radio": {"radio":"wl1","action":"scan_finished"} }