adjust first beacon offset (#474) #1282

Job	Run time
hygiene	2m 11s
build (arm-unknown-linux-gnueabihf)	2m 22s
build (armv5te-unknown-linux-musleabi)	2m 34s
build (armv7-unknown-linux-musleabihf)	2m 22s
build (aarch64-unknown-linux-musl)	2m 29s
build (mips-unknown-linux-musl)	2m 26s
build (mipsel-unknown-linux-musl)	2m 28s
build (x86_64-unknown-debian-gnu)	2m 32s
build (x86_64-tpm-debian-gnu)	2m 47s
docker_buildx	6m 47s
release	0s
	28m 58s

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