[MaL] Remove output from destructor.

The time for the linear solver is written already in NonLinearSolver::solver().

MathLib/LinAlg/PETSc/PETScLinearSolver.h

@@ -55,9 +55,6 @@ class PETScLinearSolver
 
         ~PETScLinearSolver()
         {
-            INFO("Time elapsed in PETSc ksp solver for equation: %g s.\n",
-                 _elapsed_ctime);
-
             KSPDestroy(&_solver);
         }