advpack: fix off-by-one error in AdvInstallFileW that caused buffer overrun

[Dan Kegel]

 Found by valgrind in log
 http://kegel.com/wine/valgrind/logs/2009-11-26-06.08/vg-advpack_files.txt
 Fixes warning:
  Invalid write of size 2
     at  strcpyW (unicode.h:224)
     by  lstrcpyW (string.c:104)
     by  AdvInstallFileW (files.c:283)
     by  AdvInstallFileA (files.c:216)
     by  test_AdvInstallFile (files.c:513)
   Address 0x7f0381a6 is 0 bytes after a block of size 30 alloc'd
     at  notify_alloc (heap.c:247)
     by  RtlAllocateHeap (heap.c:1695)
     by  AdvInstallFileW (files.c:282)
     by  AdvInstallFileA (files.c:216)
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