Fixed Issues since Linux Mint 19 BETA

All editions
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artwork:
    mint-x:
        no icons in Online accounts > Information about Gnome online accounts -> Gnome Contacts, Gnome Documents, Gnome Maps and Gnome Photos
    mint-y:
        thunderbird icon isn't the same as its flatpak
        in nemo additional pane, select a folder in the left page, click in the right pane. The selected folder in the left pane is white on grey, almost invisible.

Cinnamon Edition
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MATE Edition
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Xfce Edition
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