Apply Laravel coding style

Shift automatically applies the Laravel coding style - which uses the PSR-12 coding style as a base with some minor additions.

You may customize the code style applied by configuring [Pint](https://laravel.com/docs/pint), [PHP CS Fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer), or [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) for your project root.

For more information on customizing the code style applied by Shift, [watch this short video](https://laravelshift.com/videos/shift-code-style).

app/Http/Controllers/Agent/helpdesk/ImapMail.php

@@ -17,8 +17,7 @@ class ImapMail extends Mailbox
      * This function uses imap_search() to perform a search on the mailbox currently opened in the given IMAP stream.
      * For example, to match all unanswered mails sent by Mom, you'd use: "UNANSWERED FROM mom".
      *
-     * @param string $criteria See http://php.net/imap_search for a complete list of available criteria
-     *
+     * @param  string  $criteria See http://php.net/imap_search for a complete list of available criteria
      * @return array mailsIds (or empty array)
      */
     public function searchMailbox($criteria = 'ALL')