Don't add citation metadata on author page

[rakyi]

Fixes #3682

[owidbot]

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Login: ssh owid@staging-site-fix-author-page-citation

• Site-screenshots: https://github.com/owid/site-screenshots/compare/fix-author-page-citation
• SVG tester: https://github.com/owid/owid-grapher-svgs/compare/fix-author-page-citation

SVG tester:

Number of differences (default views): 0 ✅ Number of differences (all views): 0 ✅

Edited: 2024-06-06 14:15:55 UTC Execution time: 1.14 seconds