Extra semicolons in mid-word nested Typst emph/strong formatting

Hi!

When you have nested formatting in markdown without spaces after (like `*He**ll**o*`), pandoc generates invalid Typst syntax with extra semicolons where there shouldn't be any.

Example:

```bash
echo "*He**ll**o*" | pandoc -t typst
```

**Actual output:**
```typst
#emph[He#strong[ll];o]
```

**Should be:**
```typst
#emph[He#strong[ll]o]
```

The same happens when we nest emph within strong.