fix kdenlive clipstabilize trf output

--- /tmp/kdenlive-0.9.10/src/project/clipstabilize.cpp  2014-10-05 10:55:35.000000000 +0100
+++ ./src/project/clipstabilize.cpp 2014-12-18 00:48:25.505063003 +0000
@@ -78,7 +78,8 @@

                                if (m_filtername=="vidstab"){
                                // Some default params have to be set:
-                               m_fixedParams << "algo=1" << "relative=1";
+                               QString filename = dest_url->url().path().append(".trf");
+                               m_fixedParams << "algo=1" << "relative=1" << QString("filename=%1").arg(filename);
                                QStringList ls;
                                ls << "accuracy,type,int,value,8,min,1,max,10,tooltip,Accuracy of Shakiness detection";
                                ls << "shakiness,type,int,value,4,min,1,max,10,tooltip,How shaky is the Video";