[5.x] Revert #1615 (#1620)

* revert #1615

* fix: style-ci

Author: amirhshokri

src/HorizonServiceProvider.php

@@ -7,7 +7,6 @@
 use Illuminate\Queue\QueueManager;
 use Illuminate\Support\Facades\Route;
 use Illuminate\Support\ServiceProvider;
-use InvalidArgumentException;
 use Laravel\Horizon\Connectors\RedisConnector;
 
 class HorizonServiceProvider extends ServiceProvider
@@ -160,15 +159,7 @@ protected function configure()
             __DIR__.'/../config/horizon.php', 'horizon'
         );
 
-        $connection = config('horizon.use', 'default');
-
-        if ($connection === 'horizon') {
-            throw new InvalidArgumentException(
-                'The Redis connection name [horizon] is reserved for internal use.'
-            );
-        }
-
-        Horizon::use($connection);
+        Horizon::use(config('horizon.use', 'default'));
     }
 
     /**