Redirected to the reverse proxy port when saving Encryption settings

### 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

Custom package (OpenWrt, HomeAssistant, etc; please mention in the description)

### Setup

On one machine

### AdGuard Home version

0.107.48

### Action

I saved the Encryption settings, then a page with a connection error has been displayed

### Expected result

be redirected to the same page with the same URL

### Actual result

I'm redirected to the reverse proxy port: `https://adguard.example.com:3002/#encryption`

### Additional information and/or screenshots

the redirection is: `https://adguard.example.com/#encryption` -> `https://adguard.example.com:3002/#encryption`

The installation is using the [YunoHost package](https://github.com/YunoHost-Apps/adguardhome_ynh)
I'm one of its maintainers, btw