fix(hidpp20): AdjustableDPI getSensorDPIList loop off-by-one

[jelmerdehen]

Summary

The loop in AdjustableDPI::getSensorDPIList:

for (std::size_t i = 1; i < response.size(); i += 2) {
    uint16_t dpi = response[i + 1];
    ...
}

bounds i against response.size() but reads response[i + 1]. Whenever response.size() is even (e.g. a Long response of 16 bytes), the final iteration reads one byte past the buffer.

Fix

Tighten the bound to i + 1 < response.size().

Test plan

• Builds cleanly.
• DPI list still parses correctly on a real adjustable-DPI mouse.