Fix embedded asset path manipulation #34652

Job	Run time
build (windows-latest)	6m 36s
check-bevy-internal-imports	3s
build (ubuntu-latest)	3m 4s
check-doc	6m 53s
build (macos-latest)	4m 5s
check-missing-examples-in-docs	28s
ci	2m 52s
miri	7m 3s
run-examples-on-windows-dx12	15m 14s
toml	5s
check-missing-features-in-docs	32s
markdownlint	1m 9s
check-compiles	3m 49s
build-wasm	1m 7s
msrv	1m 22s
	54m 22s

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