update track image xpath for decipher
update track image xpath for decipher

andrewyatz/public-plugins,Ensembl/public-plugins,muffato/public-plugins,andrewyatz/public-plugins,Ensembl/public-plugins,andrewyatz/public-plugins,muffato/public-plugins,andrewyatz/public-plugins,andrewyatz/public-plugins,Ensembl/public-plugins,muffato/public-plugins,muffato/public-plugins