client: Fix keyboard navigation with `scroll_to_article_header=0` #891

Job	Run time
Check with PHP 8.3 and sqlite storage backend	1m 14s
Check with PHP 8.2 and sqlite storage backend	1m 6s
Check with PHP 8.1 and sqlite storage backend	1m 11s
Check with PHP 8.0 and sqlite storage backend	1m 9s
Check with PHP 7.4 and sqlite storage backend	1m 29s
Check with PHP 8.2 and mysql storage backend	1m 10s
Check with PHP 8.2 and postgresql storage backend	1m 14s
Upload artefacts	1m 25s
	9m 58s

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