Domain specific upstream servers going through fallback servers

### Prerequisites

- [x] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) and found no answer

- [x] I have searched other issues and found no duplicates

- [x] I want to report a bug and not [ask a question or ask for help](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a)

- [x] I have set up AdGuard Home correctly and [configured clients to use it](https://github.com/AdguardTeam/AdGuardHome/wiki/Clients). (Use the [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) for help with installing and configuring clients.)

### Platform (OS and CPU architecture)

Linux, AMD64 (aka x86_64)

### Installation

Docker

### Setup

On one machine

### AdGuard Home version

v0.107.79

### Action

I have adguard set so domain "lan" uses upstream "10.x.x.1". "lan" domain is given by dhcp and I want it resolved by the router that does DHCP.
There is the "wpad.lan" domain windows (probably more) stuff uses for web proxy autodiscovery.
I have it not setup so it should go nowhere.
Probably happens with more "hostnames.lan"

### Expected result

"wpad.lan" gets a nxdomain or whatever from the 10.x.x.1 upstream.
If it fails it fails but doesn't go upstream elsewhere

### Actual result

At least "wpad.lan", and maybe all of the ".lan" or the ones that my router doesn't respond go to the fallback servers

### Additional information and/or screenshots

Relevant probably: https://github.com/AdguardTeam/AdGuardHome/issues/7931