`/v2/skiffs`: Missing skiff skins

[darthmaim]

Current Behavior

When querying the endpoint /v2/skiffs some mount skins are missing.

Expected Behavior

Expected behavior is that all mount skins be available on this endpoint.

Currently missing:

• Alchemic Power Skiff Skin
• Haunted Ghost Skiff Skin
• Luxury Speeder Skiff Skin
• Queensdale Academic Skiff Skin

See https://wiki.guildwars2.com/wiki/Skiff#List_of_Skiff_skins

Steps To Reproduce

Query /v2/skiffs?ids=all to see that the skiffs listed above are missing.

Happening since

No response

Anything else?

See #65 for missing mount skins.

[darthmaim]

These are all whitelisted now