[SYS] Remove handleJsonQueue wrapper and use std::string (#2038)

Co-authored-by: Florian <1technophile@users.noreply.github.com>

main/ZsensorINA226.ino

@@ -73,7 +73,7 @@ void MeasureINA226() {
     INA226data["current"] = current;
     INA226data["power"] = power;
     INA226data["origin"] = subjectINA226toMQTT;
-    handleJsonEnqueue(INA226data);
+    enqueueJsonObject(INA226data);
   }
 }