charts: remove INFINITY (0Hz) from intervals

It's nice to be able to blindly hit Mod1+Left a bunch to minimize
the monitoring overhead, like when trying to preserve battery
etc.  But I've found myself sometimes annoyed that I've
completely disabled the monitors when I reach for the overlays.

This change removes the 0Hz option from the preset intervals, so
now when you lower monitoring by blindly hitting Mod1+Left a
bunch it'll bottom out at 1HZ.

A subsequent commit will wire up disabling the monitors to an
explicit vwm key combo (probably Mod1+z).

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