shdocvw: pretend succes in WebBrowser_get_RegisterAsDropTarget

[Louis. Lenders]

Hi, this fixes crash in AutowikiBrowser. As the function below this one, WebBrowser_put_RegisterAsDropTarget also returns S_OK, returning S_OK here seems pretty harmless to me. See http://bugs.winehq.org/show_bug.cgi?id=8499




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