fix: adjust webiner CET time in banner

[gminn]

Summary

The banner incorrectly says 7PM CET. Fix it to say 6PM CET

Test Plan

Visual check

[gminn]

• #510 👈
• master

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[cloudflare-pages[bot]]

Deploying interrupt with    Cloudflare Pages

Latest commit:	2bc0052
Status:	✅  Deploy successful!
Preview URL:	https://e88839a2.interrupt.pages.dev
Branch Preview URL:	https://gminn-fix-webinar-time.interrupt.pages.dev

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[gminn]

Merge activity

• Aug 22, 10:01 AM EDT: @gminn started a stack merge that includes this pull request via Graphite.
• Aug 22, 10:01 AM EDT: @gminn merged this pull request with Graphite.