Disable left touch edge by default

Disable left touch edge by default

Origin: upstream, https://invent.kde.org/plasma/kwin/commit/3df7985570c748cc47362de9bbae0eb580f8f839

On X11, it creates a dead pixel on the left edge which interferes with
left panels, the left-nost widget on bottom and top panels, and scroll
events on the left-most pixel in various apps.

It works properly on Wayland, but unfortunately turning it off by
default only on X11 but not Wayland is not easily doable. So let's turn
it off by default everywhere.

BUG: 387775
FIXED-IN: 5.21

Gbp-Pq: Name fix-left-edge-dead-pixel.patch