X11 - Ignore scroll events that happen outside of Glutin windows

Scroll deltas are calculated in X11 by comparing the current and
previous absolute values for the scroll axis when a scroll motion
event is received. If the user scrolls whilst the cursor is outside
of the window then an incorrect delta is reported when the cursor
re-enters the window.

Fix this by resetting the last-seen axis values whenever the cursor
re-enters the window.

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