Update supervisord.conf

We have project in `/var/www` by default, not in `/var/www/laravel`

https://github.com/laradock/laradock/issues/731

php-worker/supervisord.conf

@@ -2,7 +2,7 @@
 nodaemon=true
 [program:laravel-worker]
 process_name=%(program_name)s_%(process_num)02d
-command=php /var/www/laravel/artisan queue:work --sleep=3 --tries=3 --daemon
+command=php /var/www/artisan queue:work --sleep=3 --tries=3 --daemon
 autostart=true
 autorestart=true
 numprocs=8