fix: specify transport in fewer places to let config control

[pauldambra]

let's only specify a non-default transport if it matters

(follow up to #1612 because i realised this after review)

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	🛑 Canceled (Inspect)		Dec 17, 2024 10:44am

[github-actions]

Size Change: -540 B (-0.02%)

Total Size: 3.22 MB

Filename	Size	Change
dist/array.full.es5.js	261 kB	-54 B (-0.02%)
dist/array.full.js	365 kB	-54 B (-0.01%)
dist/array.full.no-external.js	364 kB	-54 B (-0.01%)
dist/array.js	179 kB	-54 B (-0.03%)
dist/array.no-external.js	177 kB	-54 B (-0.03%)
dist/main.js	180 kB	-54 B (-0.03%)
dist/module.full.js	365 kB	-54 B (-0.01%)
dist/module.full.no-external.js	364 kB	-54 B (-0.01%)
dist/module.js	179 kB	-54 B (-0.03%)
dist/module.no-external.js	178 kB	-54 B (-0.03%)

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	206 kB
dist/customizations.full.js	12.6 kB
dist/dead-clicks-autocapture.js	14.4 kB
dist/exception-autocapture.js	9.48 kB
dist/external-scripts-loader.js	2.48 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	57.6 kB
dist/surveys.js	63.3 kB
dist/tracing-headers.js	1.76 kB
dist/web-vitals.js	10.4 kB

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