quirks: add quirk for Dell XPS 15 9500 touchpad
The Dell XPS 15 9500 has a large touchpad without any visible markers for the touchpad buttons. Since the ModelTouchpadVisibleMarker quirk is enabled by default for all Dell touchpads, the middle button area ends up too small. Disable the quirk again for this specific model.
Fixes #545 (closed)
Signed-off-by: Jef Driesen jefdriesen@telenet.be