user[3/5]: handle special cases for SPI_SETDESKWALLPAPER

[Andrew Ziem]

The special cases remove the wallpaper or set it to default.  
Previously, these cases were ignored, so Wine would crash.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: user3.patch
Type: text/x-patch
Size: 2630 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20060610/2ac5f2f2/user3.patch