Multisite handling in uninstall.php

uninstall.php’s handling of multisite should be fixed:

$blog_ids = $wpdb->get_col( "SELECT blog_id FROM $wpdb->blogs" );

	foreach ( $blog_ids as $blog_id ) {
		switch_to_blog( $blog_id );

		// Delete blog option
		delete_option( $option_name );
	}

	restore_current_blog();

restore_current_blog() should go inside the foreach loop, as it needs to be called after every switch_to_blog.