Install regression

[Mike Hearn]

It's kind of sad nobody noticed this for so long, but it seems the new
visual regedit tool caused a major regression in the ./tools/wineinstall
script - of course rather than simply importing the winedefault.reg file
it now pops up the regedit window. 

I'd submit a patch but I have no idea why this happens - the new regedit
*does* support importing reg files from the command line right?

thanks -mike