That is a Gnome-shell icon. You have to manually edit the Gnome-shell icon for that - please see my post on how to: [HowTo] Change the "Show Application" icon on Gnome
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That is a Gnome-shell icon. You have to manually edit the Gnome-shell icon for that - please see my post on how to: [HowTo] Change the "Show Application" icon on Gnome