Update all of the permissions checking to be constant based

app/Http/Requests/Api/Client/Servers/Subusers/GetSubuserRequest.php

@@ -2,6 +2,7 @@
 
 namespace Pterodactyl\Http\Requests\Api\Client\Servers\Subusers;
 
+use Pterodactyl\Models\Permission;
 use Pterodactyl\Http\Requests\Api\Client\ClientApiRequest;
 
 class GetSubuserRequest extends ClientApiRequest
@@ -9,10 +10,10 @@ class GetSubuserRequest extends ClientApiRequest
     /**
      * Confirm that a user is able to view subusers for the specified server.
      *
-     * @return bool
+     * @return string
      */
-    public function authorize(): bool
+    public function permission(): string
     {
-        return $this->user()->can('user.read', $this->route()->parameter('server'));
+        return Permission::ACTION_USER_READ;
     }
 }