tdf#91574 fix presenter console not displayed

The bool simplification from 3ac5138c
accidentally changed the logic of the return statement

Change-Id: Id6075356184e340dc970d2e59d1fb1d1a173d0a7
Reviewed-on: https://gerrit.libreoffice.org/16748Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

canvas/source/vcl/spritecanvas.cxx

@@ -145,7 +145,7 @@ namespace vclcanvas
         // avoid repaints on hidden window (hidden: not mapped to
         // screen). Return failure, since the screen really has _not_
         // been updated (caller should try again later)
-        return !mbIsVisible && maCanvasHelper.updateScreen(bUpdateAll,
+        return mbIsVisible && maCanvasHelper.updateScreen(bUpdateAll,
                                                                   mbSurfaceDirty);
     }