shlapi: Fixes for UrlIsW and UrlIsA

[Troy Rollo]

Testing under Windows shows that UrlIsW and UrlIsA should:

 - ignore everything after the ":" when testing for URLIS_OPAQUE.
   This option tests the structure of the scheme, not the structure of
   the URL.

 - only test for "file:" at the start of the URL for URLIS_FILEURL.
   it does not matter whether this is followed by "//" (or anything else).

ChangeLog:
 Corrections to UrlIsW and UrlIsA.
 URL_IS_OPAQUE results depend only on the scheme, not on the URL.
 URL_IS_FILEURL also only depends on the scheme ("file:").
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