minor #38299 [ErrorHandler] Return false directly and remove unused variable (fancyweb)

minor #38299 [ErrorHandler] Return false directly and remove unused variable (fancyweb)

This PR was merged into the 4.4 branch.

Discussion
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[ErrorHandler] Return false directly and remove unused variable

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | https://github.com/symfony/symfony/issues/37848
| License       | MIT
| Doc PR        | -

To return true, $type and $log both need to be true. But to enter the condition, one of them has to be false.

I also spotted an unused variable below so I removed it.

Commits
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3933957d1a [ErrorHandler] Return false directly and remove unused variable