shell32: in SHNameTranslate use the right part of the string for sizing

[Aric Stewart]

when using MultiByteToWideChar to get the size of the part of the string 
we are translating we should not use the pointer to the end of the 
string instead the pointer to the beginning of the string.

Solves a number of problems with IE in multibyte locales
---
  dlls/shell32/shlfileop.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)
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