Remove standard lint warnings

lib/renderer/extensions/i18n.js

@@ -18,9 +18,9 @@ const getExtensionMetadata = (extensionId) => {
 }
 
 const getMessagesPath = (extensionId, language) => {
-  const {srcDirectory, default_locale} = getExtensionMetadata(extensionId)
-  const defaultLocale = default_locale != null ? default_locale : 'en'
-  const localesDirectory = path.join(srcDirectory, '_locales')
+  const metadata = getExtensionMetadata(extensionId)
+  const defaultLocale = metadata.default_locale || 'en'
+  const localesDirectory = path.join(metadata.srcDirectory, '_locales')
   let messagesPath = path.join(localesDirectory, language, 'messages.json')
   if (!fs.statSyncNoException(messagesPath)) {
     messagesPath = path.join(localesDirectory, defaultLocale, 'messages.json')