touchpad: increase palm edge zones to 8%

Most modern touchpads are around 100mm wide, so this provides a ca 8mm edge
zone on each side. The extra 3mm should provide for more reliable palm
detection, a few touches happen to be just on the edge of the 5mm mark.

https://bugs.freedesktop.org/show_bug.cgi?id=101433

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 381cce8)

src/evdev-mt-touchpad.c

@@ -2278,12 +2278,12 @@ tp_init_palmdetect_edge(struct tp_dispatch *tp,
 	if (width < 70.0)
 		return;
 
-	/* palm edges are 5% of the width on each side */
-	mm.x = width * 0.05;
+	/* palm edges are 8% of the width on each side */
+	mm.x = width * 0.08;
 	edges = evdev_device_mm_to_units(device, &mm);
 	tp->palm.left_edge = edges.x;
 
-	mm.x = width * 0.95;
+	mm.x = width * 0.92;
 	edges = evdev_device_mm_to_units(device, &mm);
 	tp->palm.right_edge = edges.x;
 }