shlwapi: Simplify UrlCombine case 2 with tests.

[Aric Stewart]

I could not find justification for the previous behavior. No test I 
wrote added an additional backslash on the URL.
---
  dlls/shlwapi/tests/url.c |   23 ++++++++++++++++++++++-
  dlls/shlwapi/url.c       |   22 +---------------------
  2 files changed, 23 insertions(+), 22 deletions(-)


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