add allow_unencrypted_doh field to api

[mazzz1y]

Issue: https://github.com/AdguardTeam/AdGuardHome/issues/5207

POST /control/tls/configure
{
    "allow_unencrypted_doh": true
}

GET /control/tls/status
{
    ...
    "allow_unencrypted_doh": true,
    ...
}