FactMetaData: Fix default for decimal places (#10589)

When metadata was loaded from JSON and decimal places weren't
specified it was set to 0 when it should have been set to
kUknownDecimalPlaces (which will in turn default to 3).

---------

Co-authored-by: Don Gagne <dongagne@outlook.com>

src/FactSystem/FactMetaData.cc

@@ -1337,7 +1337,7 @@ FactMetaData* FactMetaData::createFromJsonObject(const QJsonObject& json, QMap<Q
         }
     }
 
-    metaData->setDecimalPlaces(json[_decimalPlacesJsonKey].toInt(0));
+    metaData->setDecimalPlaces(json[_decimalPlacesJsonKey].toInt(kUnknownDecimalPlaces));
     metaData->setShortDescription(json[_shortDescriptionJsonKey].toString());
     metaData->setLongDescription(json[_longDescriptionJsonKey].toString());