replace the use of calculate buffer by a constant buffer size for json size

ZsensorBH1750.ino

@@ -55,8 +55,7 @@ void MeasureLightIntensity()
 {
   if (millis() > (timebh1750 + TimeBetweenReadingBH1750)) {//retriving value of Lux, FtCd and Wattsm2 from BH1750
     trc(F("Creating BH1750 buffer"));
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
-    StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonBuffer;
+    StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
     JsonObject& BH1750data = jsonBuffer.createObject();
     
     timebh1750 = millis();