include: Provide the likely GUID for ITextHost2.

[Dylan Smith]

The ITextHost2 interface is completely undocumented, however, adding a
trace to the windowless richedit tests let me to believe that the
unknown interface it is requesting is for ITextHost2.

Previously the GUID given for ITextHost2 in wine's include/textserv.h
was the same one as ITextHost.
---
 include/textserv.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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