[shlwapi] fix UrlCanonicalizeW's handling of filesystem paths

[Damjan Jovanovic]

Changelog:
* Changed UrlCanonicalizeW to use backslashes and prefix file://
instead of file:/// with URL_FILE_USE_PATHURL, and to escape unsafe
characters without that flag, for filesystem paths without a file://
prefix.
* Added tests to prove the new behavior is right.

Damjan Jovanovic
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