wshom: Use signed type for ExitCode in IWshShell3::Run().

Merged Robert Wilhelm requested to merge sloper42/wine:wshom into master

DWORD is unsigned and will be converted to VT_UI4 variant when used from VBScript. But VT_UI4 is no VBScript data type and should not be used as retval. Better use signed type.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53542

Signed-off-by: Robert Wilhelm robert.wilhelm@gmx.net

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