Fixed/ Logged out error modal.

[letscodedanish]

Fixes #3053

Changes:

With this update, the downloadSketch function now ensures that the project is only exported when the conditions regarding the logged-in user and ownership of the project are met. This helps prevent unnecessary API requests and improves the user experience by handling the download functionality more efficiently.

I have verified that this pull request:

• [x] has no linting errors (npm run lint)
• [x] has no test errors (npm run test)
• [x] is from a uniquely-named feature branch and is up to date with the develop branch.
• [x] is descriptively named and links to an issue number, i.e. Fixes #[issue-number]