client/systray: replace counter metric with gauge

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Replace the existing systray_start counter metrics with a
systray_running gauge metrics.

This also adds an IncrementGauge method to local client to parallel
IncrementCounter. The LocalAPI handler supports both, we've just never
added a client method for gauges.

Updates #1708

Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d
Signed-off-by: Will Norris <will@tailscale.com>

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