add missing config.ini entries for InfluxDBv2

sd-card/config/config.ini

@@ -70,6 +70,14 @@ HomeassistantDiscovery = false
 ;user = undefined
 ;password = undefined
 
+;[InfluxDBv2]
+;Uri = undefined
+;Database = 
+;Measurement = undefined
+;Org = undefined
+;token = undefined
+;main.fieldname = undefined
+
 ;[GPIO]
 ;MainTopicMQTT = wasserzaehler/GPIO
 ;IO0 = input disabled 10 false false