Fix sqlite error in test schema

```
ActiveRecord::StatementInvalid: SQLite3::SQLException: object name reserved
for internal use: sqlite_autoindex_custom_primary_key_records_1: CREATE
UNIQUE INDEX "sqlite_autoindex_custom_primary_key_records_1" ON
"custom_primary_key_records" ("uuid")
```

test/dummy/db/schema.rb

@@ -91,7 +91,7 @@ ActiveRecord::Schema.define(version: 20110208155312) do
     t.string   "name"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.index ["uuid"], name: "sqlite_autoindex_custom_primary_key_records_1", unique: true
+    t.index ["uuid"], unique: true
   end
 
   create_table "customers", force: :cascade do |t|