User permissions not letting me toggle as operator

## README.md update needed?
A note it seems that the [permissions](https://github.com/itzg/docker-minecraft-bedrock-server?tab=readme-ov-file#permissions) need to be updated. The docs have a space between the env and the value which is parsed wrong. There appears to need to be either no space or an equal. I can update the README.md if that makes sense.

## My issue.
The issue I am having is that I give my user xuid ops permissions and I can verify that on the container in the permissions.json. When I am in the game it looks like I have access to games setting specifically showing cords but the toggle won't toggle. It just makes the noise and nothing happens. Is there something else that needs to be done?

```
sudo docker run -d --rm --name mc_server -e EULA=TRUE -e OPS="not-gonna-say-this" -e DIFFICULTY="normal" -p 19132:19132/udp -v mc-volume:/data itzg/minecraft-bedrock-server
```

## Note to maintainer
This is great. My kid and I get to play minecraft and I am getting to teach him docker. If there is anything I can do to lend a hand please let me know.

Start with README.md's permissions section and the supplied docker run command; verify how the OPS value is documented and parsed. Confirm whether the in-game operator toggle works with the documented syntax, and update README.md only if that behavior is reproduced.

Written by the indexing model from the issue text.