wfadatad: fix wifi_sta events data.
update the wifi_sta events data to align with this format: i.e. { "wifi.sta": {"ifname":"wlan1","event":"connected","data":{"macaddr":"72:4f:21:5b:46:ec"}} }
update the wifi_sta events data to align with this format: i.e. { "wifi.sta": {"ifname":"wlan1","event":"connected","data":{"macaddr":"72:4f:21:5b:46:ec"}} }