client: Fix keyboard navigation with `scroll_to_article_header=0` #889

Job	Run time
Check with PHP 8.3 and sqlite storage backend	1m 21s
Check with PHP 8.2 and sqlite storage backend	1m 5s
Check with PHP 8.1 and sqlite storage backend	1m 7s
Check with PHP 8.0 and sqlite storage backend	1m 10s
Check with PHP 7.4 and sqlite storage backend	1m 25s
Check with PHP 8.2 and mysql storage backend	1m 23s
Check with PHP 8.2 and postgresql storage backend	1m 11s
Upload artefacts	1m 22s
	10m 4s

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