ole32: Only retrieve posted and paint messages in an STA message loop.

dlls/ole32/compobj.c

@@ -3128,7 +3128,7 @@ static BOOL COM_PeekMessage(struct apartment *apt, MSG *msg)
     /* first try to retrieve messages for incoming COM calls to the apartment window */
     return PeekMessageW(msg, apt->win, WM_USER, WM_APP - 1, PM_REMOVE|PM_NOYIELD) ||
            /* next retrieve other messages necessary for the app to remain responsive */
-           PeekMessageW(msg, NULL, 0, WM_USER - 1, PM_REMOVE|PM_NOYIELD);
+           PeekMessageW(msg, NULL, 0, 0, PM_QS_PAINT|PM_QS_POSTMESSAGE|PM_REMOVE|PM_NOYIELD);
 }
 
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