removed CheckGradients, this option was removed in 2026a and its default is false anyway

(cherry picked from commit ce30108)

Author: JenHardt

matRad/optimization/optimizer/matRad_OptimizerFmincon.m

@@ -65,7 +65,6 @@
                                        'AlwaysHonorConstraints', 'bounds', ...
                                        'MaxIterations', matRad_cfg.defaults.propOpt.maxIter, ...
                                        'MaxFunctionEvaluations', 3000, ...
-                                       'CheckGradients', false, ...
                                        'HessianApproximation', {'lbfgs', 50}, ...
                                        'UseParallel', true, ...
                                        'Diagnostics', optDiag, ...