It's not a GUI created by this mod, its actually created by the bobslogistics mod.
Comment out line 181 of control.lua in that mod to disable the button.
" -- player.gui.top.add({type = "checkbox", name = "bob_logistics_inserter_button", state = global.bobmods.logistics[player_index].show, style = "bob-logistics-inserter-button"})
"
