shlwapi: Test and fix the behaviour of the CopyTo method for file sizes not multiple of the internal buffer size, on SHCreateStreamOnFileEx-returned IStreams. (try 4)

[David Quintana (gigaherz)]

Remove unnecessary complexity from the test: The issue can be
reproduced by simply creating a 1-byte file, and trying to copy 2
bytes into the new stream.

---
 dlls/shlwapi/istream.c       | 14 +++----
 dlls/shlwapi/tests/istream.c | 91 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+), 7 deletions(-)
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