SquishTests: Fix accessing navigation tree view

Change-Id: I0f392c39c75c553cc65ade4c1689cf1085f1c5a1
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/projectexplorer/projecttreewidget.cpp

@@ -126,6 +126,7 @@ class ProjectTreeView : public NavigationTreeView
 public:
     ProjectTreeView()
     {
+        setObjectName("projectTreeView"); // used by Squish
         setEditTriggers(QAbstractItemView::EditKeyPressed);
         setContextMenuPolicy(Qt::CustomContextMenu);
         setDragEnabled(true);