Iconbrowser: render theme icons as list with large icons

In icon mode, the name of the icon gets truncated.

Change-Id: I8e2081a68006907ae916c8e8fa1aeb6006acbc6d
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit 477381993a3899c73e240e0fb2dc2b9f67f8cb63)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

tests/manual/iconbrowser/main.cpp

@@ -448,7 +448,8 @@ struct IconView : public QListView
 
     IconView(QAbstractItemModel *model)
     {
-        setViewMode(QListView::IconMode);
+        setViewMode(QListView::ListMode);
+        setIconSize(QSize(64, 64));
         setUniformItemSizes(true);
         proxyModel.setSourceModel(model);
         setModel(&proxyModel);