fix: #3510868 Cast the search string before trimming it in the LinkIt matcher

Antal Ludescher-Tyukodirequested to merge
issue/anchor_link-3510868:3510868-php-8.1-compatibility into 3.0.x

Issue: https://www.drupal.org/project/anchor_link/issues/3510868

LinkIt can call the matcher with NULL, and PHP 8.1 deprecates passing NULL to ltrim().

Rebased onto 3.0.x.

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AI-Generated: Yes

Edited by Rajab Natshah

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