minor #22332 [VarDumper] Relax tests to adapt for php 7.1rc4 (nicolas-grekas)

This PR was merged into the 2.8 branch.

Discussion
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[VarDumper] Relax tests to adapt for php 7.1rc4

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #22266
| License       | MIT
| Doc PR        | -

Commits
-------

3672c01e3c [VarDumper] Relax tests to adapt for php 7.1rc4

src/Symfony/Component/VarDumper/Tests/CliDumperTest.php

@@ -296,9 +296,7 @@ stream resource {@{$ref}
       %d. %slosure%s() ==> Twig_Template->render(): {
         src: {
           %sCliDumperTest.php:{$line}: """
-                    }\\n
-                };'),\\n
-            ));\\n
+%A
             """
         }
       }