Fix deprecated create_function() call (fatal on PHP 8.0+)

[lex127]

Problem

The file vendor/class.settings-api.php at line 99 uses create_function():

$callback = create_function('', 'echo "' . str_replace( '"', '\"', $section['desc'] ) . '";');

create_function() was deprecated in PHP 7.2 and removed in PHP 8.0. On any site running PHP 8+, this causes a fatal error the moment the settings page tries to render a section description.

Why it is not crashing today

The current get_settings_sections() in includes/class-wsc-settings.php does not set desc on the section, so the bad branch is never reached. This is a latent bug — as soon as someone adds a section description, the plugin breaks on PHP 8.

Fix

Replace the call with an anonymous function and use wp_kses_post() for safe output:

$desc = $section['desc'];
$callback = function () use ( $desc ) {
    echo wp_kses_post( $desc );
};

Acceptance

• grep -r create_function returns no hits in the plugin source
• Settings page renders without errors on PHP 8.0 / 8.1 / 8.2 / 8.3
• A test section with 'desc' => '<p>Hello "world"</p>' renders correctly

Scope

Small, stability-only fix. One file, a few lines. Should ship in the next patch release.