[5.x] Removed redundant default values from config file (#1626)

PhpStorm Inspector pointed this out.

Similar to previous @ #1323

Author: weshooper

config/telescope.php

@@ -76,8 +76,8 @@
     */
 
     'queue' => [
-        'connection' => env('TELESCOPE_QUEUE_CONNECTION', null),
-        'queue' => env('TELESCOPE_QUEUE', null),
+        'connection' => env('TELESCOPE_QUEUE_CONNECTION'),
+        'queue' => env('TELESCOPE_QUEUE'),
         'delay' => env('TELESCOPE_QUEUE_DELAY', 10),
     ],