What file did you edit? I tried it right now and it works fine the fix.
The file that you must edit is (replace YourUser and YourDomain with the actual data):
/home/YourUser/web/YourDomain/public_html/system/library/template/twig.php
Edit: You can modify the file with these commands (replace YourUser and YourDomain with the actual data):
cd /home/YourUser/web/YourDomain/public_html/system/library/template/
sed -i.original "s|'/', \$this->root|'\./', \$this->root|" twig.php