Remove redeemer from mintAssets in mint.ts and nft.ts

[Copilot]

The script doesn't use redeemers, but a redeemer field was erroneously added to mintAssets calls during migration, causing script errors at runtime.

Changes

• src/mint.ts / src/nft.ts: Drop the redeemer argument from mintAssets

- .mintAssets({
-   assets: Assets.fromRecord({ [token]: amount }),
-   redeemer: new Data.Constr({ index: 0n, fields: [] }),
- })
+ .mintAssets({
+   assets: Assets.fromRecord({ [token]: amount }),
+ })

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.