mpr: Correct usage of dwScope and dwEnumeScopes [try 2]

[Konstantin Kondratyuk]

Hello!

It is the modified version of my previous patch considering Juan Lang's advice 
(thanks, Juan).

Changelog:
	correct usage of dwScope and dwEnumeScopes, and their incorrect comparison;
	add definition of a WNNC_ENUM_CONTEXT

-- 
Best regards,
Konstantin Kondratyuk.
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