domains: remove SECRET_PLACEHOLDER from responses

src/dns/bunny.js

@@ -1,15 +1,5 @@
 'use strict';
 
-exports = module.exports = {
-    removePrivateFields,
-    injectPrivateFields,
-    upsert,
-    get,
-    del,
-    wait,
-    verifyDomainConfig
-};
-
 const assert = require('node:assert'),
     BoxError = require('../boxerror.js'),
     constants = require('../constants.js'),
@@ -36,12 +26,12 @@ function formatError(response) {
 }
 
 function removePrivateFields(domainObject) {
-    domainObject.config.accessKey = constants.SECRET_PLACEHOLDER;
+    delete domainObject.config.accessKey;
     return domainObject;
 }
 
 function injectPrivateFields(newConfig, currentConfig) {
-    if (newConfig.accessKey === constants.SECRET_PLACEHOLDER) newConfig.accessKey = currentConfig.accessKey;
+    if (!Object.hasOwn(newConfig, 'accessKey')) newConfig.accessKey = currentConfig.accessKey;
 }
 
 async function getZoneId(domainConfig, zoneName) {
@@ -255,3 +245,13 @@ async function verifyDomainConfig(domainObject) {
 
     return credentials;
 }
+
+exports = module.exports = {
+    removePrivateFields,
+    injectPrivateFields,
+    upsert,
+    get,
+    del,
+    wait,
+    verifyDomainConfig
+};