Fix thumbnails with movit enabled.

Fixes #543

src/bin/projectclip.cpp

@@ -853,7 +853,7 @@ std::shared_ptr<Mlt::Producer> ProjectClip::cloneProducer(const std::shared_ptr<
 std::shared_ptr<Mlt::Producer> ProjectClip::softClone(const char *list)
 {
     QString service = QString::fromLatin1(m_masterProducer->get("mlt_service"));
-    QString resource = QString::fromLatin1(m_masterProducer->get("resource"));
+    QString resource = QString::fromUtf8(m_masterProducer->get("resource"));
     std::shared_ptr<Mlt::Producer> clone(new Mlt::Producer(*m_masterProducer->profile(), service.toUtf8().constData(), resource.toUtf8().constData()));
     Mlt::Properties original(m_masterProducer->get_properties());
     Mlt::Properties cloneProps(clone->get_properties());