msi: InstallPackage check for UI level must not disregard flags (updated)

[Felix Nawothnig]

Misha Koshelev wrote:
>>>So do you think I should add a define like INSTALLUILEVEL_NOFLAGS 
>>>somewhere set to 0xf then? 
>>Shouldn't that be 0x7?
> I guess either one would work since the first flag is 0x20. Do I need to
> change it to 0x7 or leave as is?

So would 0x1f or 0xfffffe1f. Doesn't make it correct and could fail if 
there are undocumented flags (that gap before 0x20 looks suspicious to 
me...) - and that's more likely than undocumented levels imho (and even 
with 0x7 we cover another 2).

Felix