minor #24130 Fixed deprecations in WebProfiler tests (javiereguiluz)

This PR was merged into the 3.4 branch.

Discussion
----------

Fixed deprecations in WebProfiler tests

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

To avoid this error in tests:

```
The "web_profiler.position" configuration key has been deprecated in Symfony 3.4 and it will be removed in 4.0: 1x
    1x in ConfigurationTest::testConfigTree from Symfony\Bundle\WebProfilerBundle\Tests\DependencyInjection
```

Can anybody propose a better solution to fix this issue? Thanks!

Commits
-------

2a696d3 Fixed deprecations in WebProfiler tests

Author: nicolas-grekas

CHANGELOG.md

@@ -53,8 +53,6 @@ CHANGELOG
    `EventDispatcherDebugCommand`, `RouterDebugCommand`, `RouterMatchCommand`,
    `TranslationDebugCommand`, `TranslationUpdateCommand`, `XliffLintCommand`
     and `YamlLintCommand` classes have been marked as final
- * Deprecated the `web_profiler.position` config option (in Symfony 4.0 the toolbar
-   will always be displayed at the bottom).
 
 3.3.0
 -----