The touchpad row has a switch suffix that allows enabling/disabling
touchpad.
To prevent users from being left with no pointer device, we were
hiding the suffix switch of the touchpad row, making the row look
weird with a label and no action.
Let's hide the entire row instead, as suggested by designers in
comment https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1649#note_1643002Fixes#1649