Preferences (linux) - Trackpad direction option for Wayland float left

[Draise14]

Will need a VM to test this.. But in code this should be easy to float left, then document. This is a linux exclusive.

Details

SHA-1: d644873

• Preferences: add option to set the trackpad direction for Wayland

When using a version of Wayland that doesn't support trackpad direction
show an option to set the direction manually.

While this is a stop-gap measure until compositors support seat
version 9, the latest GNOME doesn't yet support this, so there will
be users for some years without this functionality.

Addresses issue raised in #107676.