[Risolto] Function copy_from_original bad performance

Contesto del problema:
We are trying to copy content into a translation from it's original content.
The request goes in 500 error so we decided to understand why.
We found that the AJAX call used to copy the content is "copy_from_original".
Inside this call is being called the following functions (in order):
1) WPML_Post_Edit_Ajax::copy_from_original_fields
2) self::copy_meta_values_from_original
3) self::$post_custom_field_settings->get_post_meta_keys() (from WPML_Custom_Field_Setting_Factory)
4) WPML_Custom_Field_Setting_Factory::get_post_meta_keys()
5) $this->tm_instance->initial_custom_field_translate_states()

Inside the function initial_custom_field_translate_states we can see that you SELECT distinct from ALL the meta fields. As a result, in a website with many post meta the request goes in error.

Such we don't need to pull ALL the meta fields here but just the once related to the post, we suggest to improve your code by adding a filter by post_id in that function.

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