don't scale-encode witness data #22286

Job	Run time
filter-changes	9s
lint	2m 52s
build (ubuntu-22.04)	1m 19s
quicktests	1m 58s
test-contracts	1m 42s
build (ubuntu-latest-arm-8-cores)	2m 46s
coverage	20m 45s
build (self-hosted, macOS, ARM64, go-spacemesh)	29s
unittests (ubuntu-22.04)	27m 46s
unittests (ubuntu-latest-arm-8-cores)	36m 3s
unittests (self-hosted, macOS, ARM64, go-spacemesh)	23m 7s
ci-status	4s
	1h 59m 0s

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