Code review comment for lp://qastaging/~macslow/notify-osd/notify-osd.fix-1092905

The code for the multihead-mode is from a time, when unity wasn't the default desktop-environment. We had plain compiz back then. The panel could appear on only on screen in a multi-monitor setup. It was wrong to assume the panel would be cloned on every screen, like we have now with the unity-plugin.

I don't want to rewrite all of defaults_get_top_corner() now.