Use config key in place of env in firewall config file

Changelog

@@ -1,4 +1,5 @@
 2019-01-11 DariusIII
+	* Chg: Use config key in place of env in firewall config file
 	* Chg: Update install command and reduce code used
 	* Chg: Simplify UpdateNNTmuxDB.php handle function, use native artisan commands without Symfony Process component
 	* Chg: Update czproject/git-php to version 2.15.0

config/firewall.php

@@ -275,7 +275,7 @@ return [
             'model' => PragmaRX\Firewall\Vendor\Laravel\Models\User::class,
 
             'emails' => [
-                env('ADMIN_EMAIL'),
+                config('nntmux.admin_email'),
             ],
         ],