fix: remove an unnecessary await for metrics.sendMetricsEvent

[emily-shen]

fixup a stray await that was missed after making sendMetricsEvent sync

---

• Tests
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  • Tests not necessary because: typo fix
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
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  • Not required because: typo fix
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: typo fix

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[github-actions]

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---

wrangler@3.92.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241106.2
workerd	1.20241106.2	1.20241106.2
workerd --version	1.20241106.2	2024-11-06

Please ensure constraints are pinned, and miniflare/workerd minor versions match.