Bugfix: Tell the solver which problem to solve

dune/solvers/test/quadraticipoptsolvertest.cc

@@ -78,8 +78,8 @@ void solveObstacleProblemByQuadraticIPOptSolver(const GridType& grid, const Matr
     }
 #endif
     // create solver
-    Solver solver;
-
+    Solver solver(mat,x,rhs, NumProc::REDUCED);
+    solver.ignoreNodes_ = &ignore;
     // solve problem
     solver.solve();
 }