Update windows build instructions to be more generic about build configuration

[auriamg]

The wiki page http://supertuxkart.sourceforge.net/How_to_build_the_Windows_version
says "As 'Command', set: $(ProjectDir)/bin/Debug/supertuxkart.exe"

This can be changed to:
As 'Command', set: $(ProjectDir)/bin/$(Configuration)/supertuxkart.exe

This means it will be generic to both Debug and Release builds.
(I don't have access to edit this wiki page, sorry :( )

Migrated-From: https://sourceforge.net/apps/trac/supertuxkart/t/ticket/1144