- Included HAVE_UG macro in fuelcellproblem.hh when declaring

GridManager.
- Removed UG as grid manager for dissolutionproblem.hh, it uses YaspGrid
  instead now.


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15359 2fb0f335-1f38-0410-981e-8018bf24f1b0