Input preferences: some style fixes.

Problems found by running haiku-format and looking at the resulting
files. Manually triaged to keep only the correct changes, currently
haiku-format is making a lot of unwanted changes as well.

Merging the correct changes allows us to see the incorrect ones more
easily and continue working on fixing them.

Input: add icons to the DeviceList

Change-Id: I2eaebca0f0e91e3420b7e63a4a568f4e658af253
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2722
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Completed Mouse and Touchppad preferences

Complete working and view of pointing devices(mouse and touchpad).

Resolve some issues.
Added the Jamfile

Change-Id: I4db021cb8c63971e5af60bd254c8b3b588d023e9
Reviewed-on: https://review.haiku-os.org/c/1426
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>