metrics: reduce perf periodic collection interval to 3 hours from 24
metrics: reduce perf periodic collection interval to 3 hours from 24

This should increase the quantity of perf profiles collected for
chromiumos-wide-profiling by a factor of 8. Based on the current amount of
data received, this should increase the number of profiles collected to a
quantity less than it was before the collection scheduling was changed in
https://codereview.chromium.org/282093011/

TEST=Not really... This is just turning a knob. I did compile it.
BUG=chromium:413951

Review URL: https://codereview.chromium.org/559843007

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#295154}

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