Bug: line highlighting doesn't work without line numbers
When line numbers are not enabled, line highlighting doesn't work. It still fades out everything else, but it does not highlight the desired lines.
This fails:
```js
const code = `<html>
<body>
</body>
</html>`;
<CodeBlock
text={code}
language="html"
showLineNumbers={false}
highlight="2-3"
/>
```
But this works:
```js
const code = `<html>
<body>
</body>
</html>`;
<CodeBlock
text={code}
language="html"
showLineNumbers={true} // The only difference
highlight="2-3"
/>
```
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