usp10: Correct error with ScriptLayout log2vis

[Aric Stewart]

Issue found and test written by Huw Davies
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 dlls/usp10/bidi.c        |  6 ++++--
 dlls/usp10/tests/usp10.c | 15 +++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)


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