Utils: Modernize connections

Change-Id: I4650abc84e7c82a4054197319f6c849af9e5b8ce
Reviewed-by: hjk <hjk@theqtcompany.com>

src/libs/utils/pathchooser.h

@@ -142,7 +142,6 @@ private:
     QString makeDialogTitle(const QString &title);
 
 signals:
-    void validChanged();
     void validChanged(bool validState);
     void changed(const QString &text);
     void pathChanged(const QString &path);