#5304 Unescaped brace in feature-web.pl

[Thomas]

When deleting an alias to a virtual server I got this error repeatedly:
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/^\%{ <-- HERE HTTP_HOST}\s /usr/share/webmin/virtual-server/feature-web.pl line 3217

[Jamie Cameron]

This will be fixed in the next Virtualmin release - see https://github.com/virtualmin/virtualmin-gpl/commit/0c862c678ffc0ff2f638567613185f0f03bce206