box assembler: call methods enable{JacobianRecycling|PartialReassemble}...

box assembler: call methods enable{JacobianRecycling|PartialReassemble} instead of taking there adress

in effect this resulted that both methods where always (partially)
enabled regardless of what the parameter sayed. *ouch*

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@6734 2fb0f335-1f38-0410-981e-8018bf24f1b0