Prevent linebreaks in parentheses in damage enrichers when using `average`

Currently, the result can look like
```md
[...............] This deals 5 (
<roll-icon> 2d4) fire damage [...]
```
It would be good if it was enforced to be eg
```md
[...............] This deals 5
(<roll-icon> 2d4) fire damage [...]
```