Remove unused private method WP_Theme::_check_headers_property_has_correct_type()

[IanDelMar]

Trac ticket: https://core.trac.wordpress.org/ticket/64584

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[mukeshpanchal27]

This was introduced in Changeset 56835 / ed82152 by @aaronjorbin.

Aaron, do you know the reason this was added? Also, would it make sense to remove it if it’s no longer needed? It looks like the function is also missing documentation.

[mukeshpanchal27]

Thanks @IanDelMar for the PR.

Code looks good to me if we agree to remove it.