Changed behaviour of esc_sql() in WordPress 4.8.3

As part of the WordPress 4.8.3 release, there is a change in `esc_sql()` behaviour that may affect plugin developers who expect `esc_sql()` to return a string that’s usable outside of the context of building a query to send to WPDB.

While we strongly recommend you do not use `esc_sql()` for other purposes, we understand that it can be tricky to rewrite old code rapidly. To return to the old behaviour, you can use the `$wpdb->remove_placeholder_escape()` method, like so:

echo esc_sql( "100%" );
// "100{9fa52f39262a451892931117b9ab11b5a06d3a15faee833cc75edb18b4411d11}"

echo $wpdb->remove_placeholder_escape( esc_sql( "100%" ) );
// "100%"

#4-8, #4-8-3, #dev-notes, #wpdb