[EUI+] Text truncation utility demo throws under certain circumstances

[acstll]

Describe the bug
The Performance demo in the Utilities > Text truncation page throws when:

• Lines is less than 100 and
• Virtualization is on.

Impact and severity
Very low…

To Reproduce
On the new docs site:

1. Go to the Utilities > Text truncation page
2. Scroll to the Performance section (/docs/utilities/text-truncation/#performance)
3. On the demo, do the following:
4. Toggle virtualization on
5. Set Lines to 99 (or anything less than 100)
6. Inside the demo text, scroll to the very bottom

Expected behavior
Shouldn't throw…

Screenshots