Fix Mesh2d normals on webgl #33472

Job	Run time
miri	6m 48s
ci	2m 13s
build (windows-latest)	6m 24s
build (ubuntu-latest)	3m 5s
run-examples-on-windows-dx12	15m 26s
build (macos-latest)	7m 37s
toml	4s
check-bevy-internal-imports	4s
check-doc	5m 48s
check-missing-examples-in-docs	32s
check-missing-features-in-docs	47s
markdownlint	1m 22s
check-compiles	3m 44s
msrv	1m 9s
build-wasm	1m 9s
	56m 12s

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