msi: Fix handling of the NULL separator when writing registry values

[James Hawkins]

Hi,

Changelog:
* Remove the first NULL separator.
* Double-NULL terminate the REG_MULTI_SZ string.

 dlls/msi/action.c        |   24 ++++++++++++++++++
 dlls/msi/tests/install.c |   61 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+), 0 deletions(-)

-- 
James Hawkins
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