[store] swap the rro/custom store, update custom shirt outfit ID

apps/api/migrations/0021_custom_avatar_item_outfit_type.sql

@@ -0,0 +1,7 @@
+-- File every custom avatar item under OutfitType 105 (`RecRoom.Avatars.OutfitType.CustomShirt`).
+-- Creation left `outfit_type` at the column's default of 0 (Hat), and the store's
+-- user-generated-content tab searches `GET /api/customAvatarItems/v1/search?outfitTypes=105`
+-- ALONE, so the tab sat empty over a full catalog. The custom shirt is the one kind of custom avatar item the
+-- client can make, so every row written before this migration is one. Creation now writes
+-- 105 itself (src/custom-avatar-items-db.ts, OUTFIT_TYPE_CUSTOM_SHIRT).
+UPDATE custom_avatar_item SET outfit_type = 105 WHERE outfit_type = 0;