Only handle ClickFingers on left button press events

ClickFingers doesn't need to be handled on every state, only when the actual
button state changes.

This is a break from the previous behaviour which allowed pressing the
button followed by a two-finger tap to trigger the ClickFinger2 action.
Let's see if anyone complains.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Chase Douglas <chase.douglas@canonical.com>

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