change inititalization of transport vector from number of components to number...

change inititalization of transport vector from number of components to number of transportet equations. this is necessary to model 2p2cni systems.
reviewed by Katherina

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@10081 2fb0f335-1f38-0410-981e-8018bf24f1b0