REST API: Support password on non-post post types.

The password field was incorrectly only added to "post" post types, but is supported for all post types in the Dashboard UI.

Props jnylen0.
Fixes #38582.


git-svn-id: https://develop.svn.wordpress.org/trunk@39047 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

@@ -419,6 +419,8 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 			'readonly'        => true,
 		);
 
+		unset( $schema['properties']['password'] );
+
 		return $schema;
 	}