Ambiguous item duplicate check of delegate fact

[wyuinche]

Expected Behavior

DelegateFact.IsValid([]byte) must check for contract-collection-operator, not collection-operator.

Actual Behavior

The validation of duplication doesn't reflect the latest mitum-nft.

mitum-nft/nft/collection/delegate.go

Line 58 in 7cb90dc

founds := map[string]map[string]struct{}{}

Steps to Reproduce the Problem

Omit

Specifications

• commit; 7cb90dc
• os; macos ventura
• go version; go1.19