PE: Fix order of initialization

...to avoid nullptr connects.
Amends c20c2a8c86.

Change-Id: Idfb75903289f8ee2cbfc8ae49af008305342ea83
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/projectexplorer.cpp

@@ -819,10 +819,10 @@ bool ProjectExplorerPlugin::initialize(const QStringList &arguments, QString *er
 
     setupProjectTreeWidgetFactory();
 
-    setupCurrentProjectFind();
-
     dd = new ProjectExplorerPluginPrivate;
 
+    setupCurrentProjectFind();
+
     setupSanitizerOutputParser();
 
     setupJsonWizardPages();