syz-cluster/dashboard: don't smooth stats graphs #17553

Job	Run time
build	3m 20s
aux	3m 48s
gvisor	3m 55s
old	7m 1s
race_dashboard	2m 51s
dashboard	2m 14s
arch (presubmit_arch_linux)	10m 44s
arch (presubmit_arch_freebsd)	6m 17s
arch (presubmit_arch_netbsd)	3m 46s
arch (presubmit_arch_executor)	3m 14s
arch (presubmit_arch_windows)	3m 35s
race	9m 10s
arch (presubmit_arch_darwin)	3m 49s
arch (presubmit_arch_openbsd)	3m 42s
	1h 7m 26s

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