Fix cherrypick demo

[afhoffman]

Cherrypick selections are now cleared after pasting (#3240), so the demo needs a tiny change to reflect that.

• PR Description
  The cherry pick demo is failing after the changes in Clear cherry-picked commits after pasting #3240. This is just a small update to that demo to reflect the new (and more convenient) behavior from Clear cherry-picked commits after pasting #3240.

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• Docs (specifically docs/Config.md) have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[stefanhaller]

Thanks!