A teacher can unapprove a glossary entry

This test requires a course with a glossary created where entries are set to 'Approved by default = No', and a teacher and student are enrolled.

1. Log in as the student and add an entry.
2. Log in as a teacher and navigate to the glossary.
3. Verify that you see 'Waiting approval (1)' and click the link.
4. Click the tick/checkmark to approve the entry.
5. Go back to the main glossary screen and verify the entry is visible with a 'unapprove' icon (grey circle with vertical bar)
6. Click to unapprove the entry
7. Verify you now see 'Waiting approval (1)' again.