revert: remove x-posthog-token header

[frankh]

Changes

this header causes lots of preflight requests so probably isn't worth it in the end. Not in use yet so no risk to remove (just added in #1347)

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Aug 13, 2024 10:37am

[github-actions]

Size Change: -176 B (-0.02%)

Total Size: 1.17 MB

Filename	Size	Change
dist/array.full.js	333 kB	-44 B (-0.01%)
dist/array.js	154 kB	-44 B (-0.03%)
dist/main.js	155 kB	-44 B (-0.03%)
dist/module.js	154 kB	-44 B (-0.03%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	10.4 kB
dist/recorder-v2.js	110 kB
dist/recorder.js	110 kB
dist/surveys-preview.js	59.8 kB
dist/surveys.js	66 kB
dist/tracing-headers.js	8.26 kB
dist/web-vitals.js	5.79 kB

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