ProjectExplorer: Use Qt5-style connects

The heavy lifting was done by clazy.

Change-Id: I619db09a79760186b72e7662490ed1205155c1a7
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/projectexplorer/importwidget.h

@@ -49,10 +49,9 @@ public:
 signals:
     void importFrom(const Utils::FileName &dir);
 
-private slots:
+private:
     void handleImportRequest();
 
-private:
     Utils::PathChooser *m_pathChooser;
 };