touchpad: only keep low-pressure fingers alive for 2+-slot touchpads
Regression introduced by 3979b9e1, bug 105258. With that commit, we only ended real touches when we had less than nslots fake fingers down. i.e. tripletap on a 2 slot touchpad would not end the first/second touch even if the pressure goes below the threshold. e.g. Lenovo x270 needs this, see https://bugs.freedesktop.org/attachment.cgi?id=137672, it dips below the pressure threshold for the first slot and ends the second slot in the same frame as the third finger is detected. Fun times. Anyway, this breaks semi-mt touchpads, another fine category of devices, because some of those can detect hovering fingers at low pressure, see bug 105535. Because semi-mt devices are generally garbage, we treat them as single-touch devices instead. So whenever two fingers are down, we treat both as above the pressure threshold, even when they're physicall hovering. Fix this by making the x270 fix conditional on at least 2 slots. https://bugs.freedesktop.org/show_bug.cgi?id=105535 Signed-off-by:Peter Hutterer <peter.hutterer@who-t.net>