Remove theta() function from ImplicitSolver base class. #5441
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This PR provides some minor cleanup to the implicit solvers.
Added the simulation time step (potentially adaptive) as a member to the ImplicitSolver base class. This removes the need to circularly pass a_dt from the implicit solver to the nonlinear solver and back to functions in the implicit solver class (e.g., ComputeRHS()).
The time step passed to m_nlsolver->Solve() inside OneStep() from the Implicit solvers is now the appropriate fractional time step. This removes the need for the theta() function called by the preconditioner. The theta() function is removed from the ImplicitSolver base class.