fix: scehme typo in CreatributorsModal.js

[phette23]

If using a non-standard scheme, this typo causes it to be labelled with only an orphaned colon. See #648.

Description

Please describe briefly your pull request.

Changes a typo so non-ROR/GND/ORCID identifier schemes for names are labelled properly.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• [x] I'm aware of the code of conduct.
• [x] I've created logical separate commits and followed the commit message format.
• [x] I've added relevant test cases.
• [x] I've added relevant documentation.
• [x] I've marked translation strings.
• [x] I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• [x] I've NOT included third-party code (copy/pasted source code or new dependencies).
  • If you have added third-party code (copy/pasted or new dependencies), please reach out to an architect.

Frontend

• [x] I've followed the CSS/JS and React guidelines.
• [x] I've followed the web accessibility guidelines.
• [x] I've followed the user interface guidelines.