Fix ERC4906 compliance of ERC721URIStorage

[Amxx]

As pointed out by @pcaversaccio in this post

#4012 missed the ERC165 part of ERC4906. Its unclear how this value was produced, and why an ERC that doesn't include any function (only event) would have an ERC165 interfaceId.

Still, this PR makes ERC721URIStorage compliant with the ERC165 part of ERC4906.

PR Checklist

• Tests

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[pcaversaccio]

Its unclear how this value was produced

Well, the 0x49064906 comes from the EIP number lol. Twice 4906 simply.