test-touchpad: Adjust touchpad_edge_scroll_no_2fg test for gesture support

test-touchpad: Adjust touchpad_edge_scroll_no_2fg test for gesture support

Unlike all the other 2fg scroll tests the touchpad_edge_scroll_no_2fg test
puts the 2 fingers down quite far apart, this makes the pinch vs scroll
gesture detection code in the gestures branch detect a pinch causing the
test to fail.

This commit brings the finger placement in line with the other 2fg scroll
tests fixing this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>