[Finder] Fix children condition in ExcludeDirectoryFilterIterator #50885
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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 expensiveisDir
call and makes the condition more correct.