[FrameworkBundle] Fix registering ExpressionValidator

Author: nicolas-grekas

Resources/config/validator.php

@@ -75,7 +75,9 @@
 
         ->set('validator.expression', ExpressionValidator::class)
             ->args([service('validator.expression_language')->nullOnInvalid()])
-            ->tag('validator.constraint_validator')
+            ->tag('validator.constraint_validator', [
+                'alias' => 'validator.expression',
+            ])
 
         ->set('validator.expression_language', ExpressionLanguage::class)
             ->args([service('cache.validator_expression_language')->nullOnInvalid()])