display: Hide unsupported resolutions again

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.

Also prevent the scaling from being selected or activated if the
effective scaled resolution would result in an equivalently low
resolution being used.
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