[Console] [DialogHelper] Fix PHP Fatal error: Cannot call constructor in DialogHelper.php on line 37

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

Since yesterday our composer builds have been failing due to an error originating from Symfony/console. We've also been seeing duplicated deprecation warnings:

```
PHP Deprecated:  \Symfony\Component\Console\Helper\DialogHelper is deprecated since version 2.5 and will be removed in 3.0. Use QuestionHelper instead. in vendor/symfony/console/Symfony/Component/Console/Helper/DialogHelper.php on line 14
PHP Deprecated:  DialogHelper is deprecated since version 2.5 and will be removed in 3.0. Use QuestionHelper instead. in vendor/symfony/console/Symfony/Component/Console/Helper/DialogHelper.php on line 35
PHP Fatal error:  Cannot call constructor in vendor/symfony/console/Symfony/Component/Console/Helper/DialogHelper.php on line 37
```

It looks like this was introduced in PR #12737. Then #12759 was raised to change the warning to the header to only print a single warning. But rather than #12759 having #12737 as a parent and reverting it - it's parent is from before #12737 was merged. So there's now a situation of both PR having being merged - one adding deprecation warning to file header, and one adding deprecation to construct() (and also causing fatal error.)

This PR fixes the issue by reverting the breaking parent::construct() added by #12737 so essentially only #12759 is active, which adds a single deprecation warning, and does not break the code.

NB: This is the test failure for the Console component - test fails since #12737. This patch fixes this and passes all tests for the Console component.
```
$ phpunit src/Symfony/Component/Console
PHP Fatal error:  Cannot call constructor in src/Symfony/Component/Console/Helper/DialogHelper.php on line 37
```

Jason