rs: Reorder the network enum to match the `bitcoin` crate's enumeration #428

Job	Run time
plan	5s
upload-local-artifacts (aarch64-apple-darwin, macos-11, curl --proto '=https' --tlsv1.2 -LsSf htt...	11m 5s
upload-local-artifacts (x86_64-apple-darwin, macos-11, curl --proto '=https' --tlsv1.2 -LsSf http...	9m 9s
upload-local-artifacts (x86_64-unknown-linux-gnu, ubuntu-20.04, curl --proto '=https' --tlsv1.2 -...	4m 21s
should-publish	0s
publish-release	0s
	24m 40s

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