riched20/tests: fix test for vista

[André Hentschel]

Vista turns the "(WCHAR)1234" into a "(unsigned char)1234".
This causes error on vista machines<SP2:
http://test.winehq.org/data/7aeffc442cc1b9a454f1ff7d7b3175b4bba88b05/vista_esx-wvistaadm/riched20:editor.html
editor.c:3249: Test failed: EM_GETPASSWORDCHAR returned Ò (210) when set to 'x', instead of x (120)
---
  dlls/riched20/tests/editor.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)


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