msi: Create the MSI hidden window on demand

[James Hawkins]

Hi,

Fixes bug 12813 and matches native behavior.
http://bugs.winehq.org/show_bug.cgi?id=12813

Changelog:
* Create the MSI hidden window on demand.

 dlls/msi/dialog.c   |    3 +++
 dlls/msi/msi_main.c |    1 -
 2 files changed, 3 insertions(+), 1 deletions(-)

-- 
James Hawkins
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