ole32: Fix the algorithm used in ItemMonikerImpl_Hash to match native.

[Robert Shearman]

---

Based on trial and error tests starting with a single character and 
adding one character at a time.

  dlls/ole32/itemmoniker.c   |   17 ++++-------------
  dlls/ole32/tests/moniker.c |    1 -
  2 files changed, 4 insertions(+), 14 deletions(-)

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