Remove thinkpad 13 gen 2 trackpoint pre-multiply quirk to fix pointer jumping and high sensitivity

I've been having an issue with my newly acquired thinkpad 13 gen 2 where the trackpoint is very jittery with large sporadic jumps at low speeds which essentially made it unusable. Same thing for pointer and scrolling. Sensitivity was also quite high. Turns out there is a quirk that adds a pre-multiplier of 1.75 for this device. Removing it mitigates the jumping effect significantly while also reducing sensitivity, making relatively precise actions possible.

The quirk was originally introduced in this commit around 3 years ago. They reported the trackpoint was "sluggish and non responsive" in their pr. Maybe something changed in the last 3 years. Pretty sure there's no hardware problems on my end because I tested this with both the original keyboard that came with this laptop and the replacement keyboard I had to buy a couple of weeks ago.

The deltas are still a bit sporadic at low pressures, but quite manageable with no pre-multiply. May investigate ways they could be smoothed out a bit...