This recovers the testing that a USB keyboard plus touchpad combo both
set as external, only its own keyboard should affect to DWT that was
removed when Acer Hawaii combo was set as internal.
This is uncommon as usb touchpads nowadays are set as internal, but,
perhaps someone that adds a quirk for a really external combo also adds
in udev's hwdb the external integration for the touchpad, or perhaps we
should set the integration to external when AttrTPKComboLayout=below is
used for the touchpad.
The issue is if the touchpad is leave as internal every keyboard affect
DWT, not only the one that belongs to its combo.
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1415>
