xrandr-applet-popup: use colored bg again in monitor labels

*Build a cssprovider from strings, use a variable to apply the same colors as used on the rectangles shown on each monitor to the matching label backgrounds in the popup menu. Bring back the draw callback to handle it, so necessary data can be passed to mate_rr_labeler_get_rgba_for_output
*Keep disabled item dimming effects off the monitor label icons
*Tie the dynamic cssprovider to the label so it always gets the correct color

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