[Henry1p2c] boxfickslawdispersion

after the containers for Fick's law are merged into dumux-master (improve-effective-laws branch) the boxfickslawdisperion.hh of the henry1p2c test needs to be adapted to include that. Will probably not compile anymore once the changes in dumux-master are merged.

@tkurz I can change that once it is necessary, I just saw that now and wanted to write it down to not forget.