Don't reset the other axis on wheel emulation scroll buildup

The idea was that of a direction lock: as we move vertically we should not
build up any horizontal scroll motion even if we move slightly diagonally.

The effect was though that the axis would be reset completely as soon as an
event from the other axis occured. With the default threshold of 10, if one in
ten events was a REL_X, we'd never get a wheel event.

Drop this code, it's not needed. By default wheel emulation doesn't do
horizontal scrolling, if a config snippet sets XAxisMapping the user wants
horizontal scrolling. And since we just add the value anyway, as long as the
user does a roughly vertical motion we won't get over the threshold anyway.

https://bugs.freedesktop.org/show_bug.cgi?id=93617

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

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