QmlDesigner: Fix order of initialization

m_resIconSize is passed to m_iconProvider's ctor, so it should
be initialized first.

Change-Id: I7a5dfb648cce029869b1e8a36eee761a5bd46faf
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp

@@ -59,9 +59,9 @@ namespace QmlDesigner {
 
 ItemLibraryWidget::ItemLibraryWidget(QWidget *parent) :
     QFrame(parent),
-    m_iconProvider(m_resIconSize),
     m_itemIconSize(24, 24),
     m_resIconSize(24, 24),
+    m_iconProvider(m_resIconSize),
     m_itemsView(new QQuickView()),
     m_resourcesView(new Internal::ItemLibraryTreeView(this)),
     m_filterFlag(QtBasic),