minor #50885 [Finder] Fix children condition in ExcludeDirectoryFilterIterator (mvorisek)

This PR was merged into the 5.4 branch.

Discussion
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[Finder] Fix children condition in ExcludeDirectoryFilterIterator

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | no
| License       | MIT
| Doc PR        | no

see https://github.com/php/php-src/blob/6091603b5350c1ca0e792a6da604e25e2a0121c8/ext/spl/spl_directory.h#L113

Original `isDir` follow symlinks, so this PR has no effect, but it avoids expensive `isDir` call and makes the condition more correct.

Commits
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621f75f969 fix children cond

Author: nicolas-grekas

Iterator/ExcludeDirectoryFilterIterator.php

@@ -59,7 +59,7 @@ public function __construct(\Iterator $iterator, array $directories)
     #[\ReturnTypeWillChange]
     public function accept()
     {
-        if ($this->isRecursive && isset($this->excludedDirs[$this->getFilename()]) && $this->isDir()) {
+        if (isset($this->excludedDirs[$this->getFilename()]) && $this->hasChildren()) {
             return false;
         }