Fix SwapMouseButton

[Vitaly Lipatov]

It was a stupid mistake. I fixed SPI_SETMOUSEBUTTONSWAP before, but only 
SwapMouseButton was broken. Correct patch is attached.

Changelog:
remove return: break loop if can't change state during test
add test for value returned by SwapMouseButton
fix SwapMouseButton realization

-- 
Vitaly Lipatov, ALT Linux Team
Russia, Saint-Petersburg, www.etersoft.ru
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