Input preferences: remove dead code

The old keyboard preferences used to save its window position in the
keyboard_settings file. The new Input preferences does not, but part of
the code had not been removed yet so it would still open the file (and
then do nothing with it)

Change-Id: Ic5e1d6bd6a8452bd779dc73872148d5c32ab12e5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5383
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

input preferences: Updates code according to Haiku guidelines

These are the changes using tool clang-format with argument --style=haiku and the changes that were not according to guidelines have been removed.

Change-Id: I2d34370e1e0a112da895001bd220bb82b7086e90
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3827
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

s/Haiku License/MIT License/g.

They are the same thing.

Connected Devices: Mouse, Touchpad and Keyboard

-Resolve some issues.
-Added the connected devices code in the main window.
-Replace BUTTON_DEFAULTS and BUTTON_REVERT with kMsgDefaults and kMsgRevert.

Change-Id: I3b0c86fc581056859239df0fbf2c085b8d168136
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1619
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>