MAINT Remove a redundant line in multilayer perceptron (scikit-learn#27497)

Author: chkoar

sklearn/neural_network/_multilayer_perceptron.py

@@ -701,7 +701,6 @@ def _fit_stochastic(
             # restore best weights
             self.coefs_ = self._best_coefs
             self.intercepts_ = self._best_intercepts
-            self.validation_scores_ = self.validation_scores_
 
     def _update_no_improvement_count(self, early_stopping, X_val, y_val):
         if early_stopping: