Simplify examples/3d/orthographic #33734

Job	Run time
build (windows-latest)	4m 5s
ci	2m 12s
miri	7m 24s
build (ubuntu-latest)	2m 29s
toml	4s
build (macos-latest)	6m 1s
check-bevy-internal-imports	9s
check-doc	5m 55s
check-missing-examples-in-docs	32s
run-examples-on-windows-dx12	14m 1s
check-missing-features-in-docs	29s
markdownlint	1m 17s
check-compiles	2m 57s
build-wasm	59s
msrv	1m 5s
	49m 39s

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