syz-cluster/dashboard: don't smooth stats graphs #17555

Job	Run time
arch (presubmit_arch_executor)	3m 19s
old	7m 2s
race	8m 53s
build	3m 21s
race_dashboard	2m 46s
arch (presubmit_arch_windows)	3m 29s
arch (presubmit_arch_darwin)	3m 49s
aux	3m 57s
arch (presubmit_arch_freebsd)	6m 24s
gvisor	3m 52s
dashboard	2m 7s
arch (presubmit_arch_openbsd)	3m 55s
arch (presubmit_arch_netbsd)	3m 41s
arch (presubmit_arch_linux)	10m 16s
	1h 6m 51s

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