[autopatch] Fix Host and X-Forwarded-For header spoofing

[yunohost-bot]

The proxied Host header may be spoofed. Description: In most cases "$host" variable are more appropriate, just use it. Additional info: https://github.com/yandex/gixy/blob/master/docs/en/plugins/hostspoofing.md

[Salamandar]

!testme

[yunohost-bot]

:carousel_horse: