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.


Signed-off-by: Robert Wilhelm

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