QmlDesigner: Fix casting of <cpp>.bool

Font.bold is of type <cpp>.bool and we did not recognize it.

Task-number: QDS-5274
Change-Id: I420dc62e1f1dc8b9e22a2c0678c882a72d8b0907
Reviewed-by: Aleksei German <aleksei.german@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/qmldesigner/designercore/metainfo/nodemetainfo.cpp

@@ -1505,6 +1505,8 @@ QVariant NodeMetaInfo::propertyCastedValue(const PropertyName &propertyName, con
         return variant.toFloat();
     } else if (typeName == "<cpp>.int") {
         return variant.toInt();
+    } else if (typeName == "<cpp>.bool") {
+        return variant.toBool();
     } else if (copyVariant.convert(typeId)) {
         return copyVariant;
     }