fix: WP_HTML_Tag_Processor::get_tag() takes no parameter

[justlevine]

Trac ticket: https://core.trac.wordpress.org/ticket/52217

This PR fixes a call to WP_HTML_Tag_Processor::get_tag() with an argument passed to the method as ::get_tag() accepts no arguments.

While this issue was surfaced via PHPStan in #7619 (trac: https://core.trac.wordpress.org/ticket/61175 ), it can be remediated independently of that ticket.

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[mukeshpanchal27]

Nice catch!

Introduce in [57514] / #60282

[SergeyBiryukov]

Thanks for the PR! Merged in r59361.