nixos/canaille: remove HTTP header X-XSS-Protection

Addresses https://github.com/NixOS/nixpkgs/issues/438800

Changed files
-1
nixos
modules
services
security
-1
nixos/modules/services/security/canaille.nix
···
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
add_header X-Frame-Options "SAMEORIGIN" always;
-
add_header X-XSS-Protection "1; mode=block" always;
add_header X-Content-Type-Options "nosniff" always;
add_header Referrer-Policy "same-origin" always;
'';