display: Hide unsupported resolutions again

Closed Daniel Drake requested to merge dsd/gnome-control-center:master into master

Previously, low resolutions were hidden from the control center because when such display modes are activated, GNOME is unusable; many important UI elements do not fit on the screen at all. https://bugzilla.gnome.org/show_bug.cgi?id=626822

This was removed in c0f686bb without explanation; reinstate it here.

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