browseui: Fix typo in declaration of empty_string in set_buffer.

[Robert Shearman]

It should be declared as an array otherwise it isn't compatible with the 
LPCWSTR type of string.
---
  dlls/browseui/progressdlg.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)
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