S60: Remove some dead code

Change-Id: Ia7da72fa2a01cd3b563fcae0d7b4d1c99acc46eb
Reviewed-on: http://codereview.qt.nokia.com/384
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Paweł Polański <jaggernod@gmail.com>

src/plugins/qt4projectmanager/qt-s60/s60deployconfiguration.cpp

@@ -75,10 +75,6 @@ QString pathFromId(const QString &id)
     return id.mid(QString::fromLatin1(S60_DC_PREFIX).size());
 }
 
-QString pathToId(const QString &path)
-{
-    return QString::fromLatin1(S60_DC_PREFIX) + path;
-}
 }
 
 // ======== S60DeployConfiguration