Config Save typo fix (#1611)

main/ZgatewayBT.ino

@@ -256,7 +256,7 @@ void BTConfig_fromJson(JsonObject& BTdata, bool startup = false) {
     jo["intervalcnct"] = BTConfig.intervalConnect;
     jo["scanduration"] = BTConfig.scanDuration;
     jo["onlysensors"] = BTConfig.pubOnlySensors;
-    jo["randommac"] = BTConfig.pubRandomMACs;
+    jo["randommacs"] = BTConfig.pubRandomMACs;
     jo["hasspresence"] = BTConfig.presenceEnable;
     jo["presenceTopic"] = BTConfig.presenceTopic;
     jo["presenceUseBeaconUuid"] = BTConfig.presenceUseBeaconUuid;