Use get_comment_type() when comparing updating comment status

Currently we don't allow updating a comment type, however in the update
code we are checking the raw value vs get_comment_type() which means a
comment of type "comment" can not be updated, as that's actually an
empty value in the database.

lib/endpoints/class-wp-rest-comments-controller.php

@@ -432,7 +432,7 @@ public function update_item( $request ) {
  return new WP_Error( 'rest_comment_invalid_id', __( 'Invalid comment id.' ), array( 'status' => 404 ) );
  }
 
- if ( isset( $request['type'] ) && $request['type'] !== $comment->comment_type ) {
+ if ( isset( $request['type'] ) && get_comment_type( $id ) !== $request['type'] ) {
  return new WP_Error( 'rest_comment_invalid_type', __( 'Sorry, you cannot change the comment type.' ), array( 'status' => 404 ) );
  }