user32: Fix Jittery Mouse movement

[EG Galano]

This fixes jittery mouse movement in Combat Arms. This was introduced
in commit 79c2e55b5a6331d15788f65a929e9e002c2f8b05

This is likely the same issue discussed here but I don't have a copy
to test: http://forum.winehq.org/viewtopic.php?t=11759&sid=9d9518057d4c0ef51be8c37d92eb1f3c
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