fix test src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
minor #11118 fix test src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php (1emming)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11118).

Discussion
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fix test src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php

src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php

| Q             | A
| ------------- | ---
| Bug fix?      | [no]
| New feature?  | [no]
| BC breaks?    | [no]
| Deprecations? | [no]
| Tests pass?   | [yes]
| Fixed tickets | []
| License       | MIT
| Doc PR        | []

When running the tests in the HTTPFoundation package these failed. I felt like fixen these so I can start working with all tests green in the package.

Commits
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9247ef5 fix test src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php