hwdb: fix size lenovo x240 touchpad (#16871)

hwdb: fix size lenovo x240 touchpad (#16871)

As discussed in https://gitlab.freedesktop.org/libinput/libinput/-/issues/521, it adds a narrower
match that only applies to X240. Other laptops that match `pvrThinkPad??40` are not affected:

$ systemd-hwdb query 'evdev:name:SynPS/2 Synaptics TouchPad:dmi:*svnLENOVO*:pvrThinkPadX240:*'
EVDEV_ABS_00=1232:5711:51
EVDEV_ABS_01=1159:4700:53
EVDEV_ABS_35=1232:5711:51
EVDEV_ABS_36=1159:4700:53
$ systemd-hwdb query 'evdev:name:SynPS/2 Synaptics TouchPad:dmi:*svnLENOVO*:pvrThinkPadX140:*'
EVDEV_ABS_00=::41
EVDEV_ABS_01=::37
EVDEV_ABS_35=::41
EVDEV_ABS_36=::37