[7.x] Use new line for route:list middleware (#32993)

With [this change](7ebd211), routes groups are now displayed using all middleware class names, instead of say `web`. Because of this, the Middleware column is massive for routes that use `web`.

I recommend changing the join to new lines, so middleware is listed just like event listeners.

Author: ellisio

src/Illuminate/Foundation/Console/RouteListCommand.php

@@ -172,7 +172,7 @@ protected function getMiddleware($route)
     {
         return collect($this->router->gatherRouteMiddleware($route))->map(function ($middleware) {
             return $middleware instanceof Closure ? 'Closure' : $middleware;
-        })->implode(',');
+        })->implode("\n");
     }
 
     /**