Fix a typo on stored meta

Author: Marco Pereirinha

cloudinary-image-management-and-manipulation-in-the-cloud-cdn/php/media/class-filter.php

@@ -558,7 +558,7 @@ public function pre_filter_rest_content( $response, $post, $request ) {
 					$data['meta'][ Global_Transformations::META_FEATURED_IMAGE_KEY ] = $disable;
 				} else {
 					// If the param was found, its a save edit, to update the meta data.
-					update_post_meta( $post->ID, Global_Transformations::META_FEATURED_IMAGE_KEY, (bool) $data['meta'] );
+					update_post_meta( $post->ID, Global_Transformations::META_FEATURED_IMAGE_KEY, (bool) $data['meta'][ Global_Transformations::META_FEATURED_IMAGE_KEY ] );
 				}
 			}
 			$response->set_data( $data );