QmlDesigner: Change name to itemVisible

Change-Id: I9eb034292f79da8d3060f7f4a917a9e2c11eeb83
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/qmldesigner/components/itemlibrary/itemlibraryitem.h

@@ -47,7 +47,7 @@ class ItemLibraryItem: public QObject {
     Q_PROPERTY(QString itemName READ itemName FINAL)
     Q_PROPERTY(QString itemLibraryIconPath READ itemLibraryIconPath FINAL)
     Q_PROPERTY(QVariant sortingRole READ sortingRole FINAL)
-    Q_PROPERTY(QVariant visible READ isVisible NOTIFY visibilityChanged FINAL)
+    Q_PROPERTY(bool itemVisible READ isVisible NOTIFY visibilityChanged FINAL)
 
 public:
     ItemLibraryItem(QObject *parent);