shlwapi: Take sizeof(WCHAR) into account when allocating Unicode string.

[Misha Koshelev]

Fixes a Vector NTI bug. The string being allocated is a Unicode string and
we should be allocating the number of character * sizeof(WCHAR) bytes, not just the
"number of characters" bytes.
---
 dlls/shlwapi/url.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
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