user32: Make traces more meaningful

[Jeff Latimer]

Adding pInstance to the trace helps work out work who is doing what in a 
conversation.

---
  dlls/user32/dde_misc.c   |    2 +-
  dlls/user32/dde_server.c |    4 ++--
  2 files changed, 3 insertions(+), 3 deletions(-)
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