Keep only first skin "default"

icons/skins/numbers/3.svg

icons/skins/numbers/4.svg

icons/skins/numbers/5.svg

icons/skins/numbers/6.svg

icons/skins/numbers/7.svg

icons/skins/numbers/8.svg

icons/skins/retro/0.svg

icons/skins/retro/1.svg

icons/skins/retro/2.svg

icons/skins/retro/3.svg

icons/skins/retro/4.svg

icons/skins/retro/5.svg

icons/skins/retro/6.svg

icons/skins/retro/7.svg

icons/skins/retro/8.svg

icons/skins/symbols/0.svg

icons/skins/symbols/1.svg

icons/skins/symbols/2.svg

icons/skins/symbols/3.svg

icons/skins/symbols/4.svg