fix(spl): pass collection account key in unverify_collection CPI

[spellsaif]

In anchor-spl/src/metadata.rs, unverify_collection and unverify_sized_collection_item incorrectly passed ctx. accounts.metadata.key as the collection field in mpl_token_metadata::instructions::UnverifyCollection and UnverifySizedCollectionItem.

This ignored ctx.accounts.collection and caused the Metaplex CPI to fail on-chain because the item's own metadata account was being passed as the collection metadata account.

Changes

• In unverify_collection, pass *ctx.accounts.collection.key to mpl_token_metadata::instructions::UnverifyCollection.collection.
• In unverify_sized_collection_item, pass *ctx.accounts.collection.key to mpl_token_metadata::instructions::UnverifySizedCollectionItem.collection.

Impact

• Fixes Metaplex unverify collection CPIs when using anchor-spl.
• Non-breaking change; aligns with the accounts struct UnverifyCollection definition.

[vercel]

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