Fix extra braces in event data

Currently associated/disassociated event data has an extra braces which makes it an invalid json and thus not getting parsed in datamodel layer

Current event data

{ "wifi.dataelements.Associated": 
{{"eventTime":"2024-09-02T12:05:37+00:00","wfa-dataelements:AssociationEvent":{"AssocData":{"BSSID":"44:d4:37:71:b4:1e","MACAddress":"52:62:84:35:3a:4f","StatusCode":0,"HTCapabilities":"AA==","VHTCapabilities":"AAAAAAAA","HECapabilities":"AAAAAA=="}}}} }

{ "wifi.dataelements.Disassociated": {{"eventTime":"2024-09-02T12:04:31+00:00","wfa-dataelements:DisassociationEvent.Disassociated":{"BSSID":"44:d4:37:71:b4:1e","MACAddress":"52:62:84:35:3a:4f","ReasonCode":256,"BytesSent":77381,"BytesReceived":49500,"PacketsSent":181,"PacketsReceived":332,"ErrorsSent":5,"ErrorsReceived":0,"RetransCount":103,"LastDataDownlinkRate":0,"LastDataUplinkRate":0,"UtilizationReceive":0,"UtilizationTransmit":0,"EstMACDataRateDownlink":0,"EstMACDataRateUplink":0,"SignalStrength":0,"LastConnectTime":0,"Noise":0,"InitiatedBy":"TODO","DisassociationLinkStats":[]}}} }

This fix removed extra braces from event payload.