Merge pull request borglab#2365 from borglab/cholesky-switch

Revert linear solver type to MULTIFRONTAL_CHOLESKY

Author: dellaert

gtsam/nonlinear/NonlinearOptimizerParams.h

@@ -112,11 +112,8 @@ class GTSAM_EXPORT NonlinearOptimizerParams {
   /// Parameters for `gtsam::MultifrontalSolver` when using `MULTIFRONTAL_SOLVER`.
 
   /// The type of linear solver to use in the nonlinear optimizer
- #ifdef GTSAM_ALLOW_DEPRECATED_SINCE_V43
   LinearSolverType linearSolverType = MULTIFRONTAL_CHOLESKY;
-#else
-  LinearSolverType linearSolverType = MULTIFRONTAL_SOLVER;
-#endif
+
   MultifrontalParameters multifrontalParams;
 
   NonlinearOptimizerParams() = default;