user32/tests: Deregister the class created by create_dde_window

[Jeff Latimer]

The class is registered but not de-registered.  This patch makes it a 
bit neater.

Jeff

---
  dlls/user32/tests/dde.c |   10 ++++++++--
  1 files changed, 8 insertions(+), 2 deletions(-)
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