mshtml: Return INET_E_USE_DEFAULT_PROTOCOLHANDLER in about protocol handler's CombineUrl.

[Jacek Caban]

---
  dlls/mshtml/protocol.c       |   34 +++++++++++++---------------------
  dlls/mshtml/tests/protocol.c |   21 +++++++++++++++++++++
  2 files changed, 34 insertions(+), 21 deletions(-)
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