Log timestamp not match system timezone

### Prerequisites

Please answer the following questions for yourself before submitting an issue. **YOU MAY DELETE THE PREREQUISITES SECTION.**

- [Y] I am running the latest version
- [Y] I checked the documentation and found no answer
- [Y] I checked to make sure that this issue has not already been filed

### Issue Details

* **Version of AdGuard Home server:**
* 0.99.3
* **How did you setup DNS configuration:**
* Router
* **If it's a router or IoT, please write device model:**
* amd64 device
* **Operating system and version:**
* OpenWrt 19.07rc2

### Expected Behavior

Log record local time (UTC+8) as like query log timestamp in WebUI
### Actual Behavior

It looks like use UTC time and not localized
### Screenshots

Screenshot:


### Additional Information