comctl32: Fix a compilation warning in 64-bit mode.

dlls/comctl32/toolbar.c

@@ -2668,7 +2668,7 @@ TOOLBAR_AddBitmapToImageList(TOOLBAR_INFO *infoPtr, HIMAGELIST himlDef, const TB
     TRACE("adding hInst=%p nID=%d nButtons=%d\n", bitmap->hInst, bitmap->nID, bitmap->nButtons);
     /* Add bitmaps to the default image list */
     if (bitmap->hInst == NULL)         /* a handle was passed */
-        hbmLoad = (HBITMAP)CopyImage((HBITMAP)bitmap->nID, IMAGE_BITMAP, 0, 0, 0);
+        hbmLoad = (HBITMAP)CopyImage(ULongToHandle(bitmap->nID), IMAGE_BITMAP, 0, 0, 0);
     else
         hbmLoad = CreateMappedBitmap(bitmap->hInst, bitmap->nID, 0, NULL, 0);