minor symfony#25648 PHP CS Fixer: no need to exclude json file (keradus)

This PR was merged into the 3.3 branch.

Discussion
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PHP CS Fixer: no need to exclude json file

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | n/a
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Commits
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ef498ac PHP CS Fixer: no need to exclude json file

Author: nicolas-grekas

.php_cs.dist

@@ -41,7 +41,5 @@ return PhpCsFixer\Config::create()
             ->notPath('Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/Resources/Custom/_name_entry_label.html.php')
             // explicit heredoc test
             ->notPath('Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/views/translation.html.php')
-            // purposefully invalid JSON
-            ->notPath('Symfony/Component/Asset/Tests/fixtures/manifest-invalid.json')
     )
 ;