G300: set DPIs as a fixed list
G300: set DPIs as a fixed list

Set the list of DPIs directly instead of use the _from_range call.

The G300 has few and coarse resolution options. Using the
exponential'ish range is not a good fit for devices with so
few dpis.

The logitech G300 can set:
250, 500, 750, 1000, 1250, 1500, 1750, 2000, 2250, 2500

but piper would offer:
250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750,
800, 850, 900, 950, 1000, 1100, 1200, 1300, 1400, 1500,
1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500

We overpromise by offering more finegrainded options than the
mouse can do and end up with three times as many options than
we should.

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