[global-prefs|application] use MATE global 'show-desktop-icons' setting

instead of a local-to-caja setting 'show-desktop'

This key would indicate that file managers (by default Caja, but applies to
others like Thunar or ROX) should handle desktop, i.e. draw a background and
place icons there. Otherwise (when false), mate-settings-daemon will take
over drawing desktop background.

This is different from 'draw-background', which is a separate option used
only for drawing background without icons (by mate-settings-daemon).
To Caja, 'show-desktop-icons' implies 'draw-background', and so if set to
false, Caja won't (needlessly) draw the desktop.
However, if the user uses the "Background & Emblems dialog" to drop an
image-pattern/color/reset on the desktop, Caja will again draw the desktop.

For reference:
https://bugzilla.gnome.org/show_bug.cgi?id=632225

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