shdocvw:WebBrowser_get_Busy implementation [take 2]

[Jared Lapsley]

Implements WebBrowser_get_Busy function defined in Bugzilla Bug #4924.
This is a low impact change that fixes Auto-Update features in programs
like Shot-Online.
dlls/shdocvw/dochost.c:
navigate_complete function resets busy bool to false.
dlls/shdocvw/navigate.c:
on_before_navigate2 function sets busy bool to true.
dlls/shdocvw/shdocvw.h:
variant_bool busy was added to DocHost structure.
dlls/shdocvw/webbrowser.c:
WebBrowser_get_Busy function implemented using DocHost busy variable.

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