update spn mainnet gas token to ETH from SPN #255

Job	Run time
E2E Tests / test	2m 26s
Unit Tests / test	33s
Check Linting / lint-webapp	34s
Check Format / format-webapp	27s
Deploy to Cloudflare / deploy-to-ipfs	3m 28s
notify-twist	0s
	7m 28s

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