Don't set Altair's embed_options to None #893

# to view logs

Job	Run time
check-rust	3m 5s
test-rust (ubuntu-20.04)	13m 54s
build-vegafusion-wasm	3m 25s
test-rust (windows-2022)	23m 28s
build-vegafusion-packages	56s
test-rust (macos-11)	39m 13s
build-vegafusion-python-embed-linux-64	2m 55s
build-vegafusion-python-embed-linux-arm64	3m 23s
build-vegafusion-python-embed-osx-64	6m 0s
build-vegafusion-python-embed-osx-arm64	6m 43s
build-vegafusion-python-embed-win-64	5m 49s
build-vegafusion-jupyter-packages	5m 50s
build-vegafusion-server-linux-64	2m 23s
build-vegafusion-server-linux-arm64	2m 25s
build-vegafusion-server-osx-64	5m 47s
build-vegafusion-server-osx-arm64	6m 5s
build-vegafusion-server-win-64	5m 3s
test-vegafusion-python-linux-64	8m 41s
test-vegafusion-jupyter-linux-64	26m 11s
test-vegafusion-python-win-64	13m 37s
test-vegafusion-python-osx-64	27m 52s
	3h 32m 45s

Provide feedback