Respect systemd clickhouse-server.service enable/disable status during update to new version

**Describe the issue**
Disabled systemd *clickhouse-server.service* became enabled after update to new version.

**How to reproduce**
1. Install clickhouse-server
1. Disable autostart `sudo systemctl disable clickhouse-server.service`
1. Check systemd service status:
```shell
systemctl is-enabled clickhouse-server.service
disabled
```
1. Wait for new version or updated release ...
1. Update clickhouse-server package
```shell
sudo apt update
sudo apt install --upgrade clickhouse-server # or just run apt upgrade
```
1. Check systemd service status:
```shell
systemctl is-enabled clickhouse-server.service
enabled
```

**Expected behavior**
Systemd service *clickhouse-server.service* should be disabled after update if it was disabled before.