A teacher can share a database activity as a preset

1. Login as a teacher, update a database activity and click the presets tab.
2. Export the database preset as a zip file.
3. Save the preset.
4. In a different course, create a database activity and import the preset zip file.
5. Check that the preset has imported correctly and that the new database activity is identical to the original.
6. In a different course, create a database activity and select the previously saved preset to import.
7. Check that the preset has imported correctly and that the new database activity is identical to the original.