chore: replace ERC721_SINGLE_EDITION with ERC721_DROP

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What does this PR do?

🤖 Generated by Copilot at 578d132

Updated the canMint condition in Nft/index.tsx to enable minting NFTs from ERC721 drops. This feature allows users to create NFTs from their publications on Lenster.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 578d132

• Enable minting NFTs from ERC721 drops (link)

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