Follow _approve overrides in ERC721._update

[frangio]

ERC721._update is currently using delete _tokenApprovals[tokenId], bypassing potential _approve overrides. Originally reported in #4377 (comment), along with an example of an _approve override that would have resulted in an issue.

This PR fixes this in a similar way to how we've set up the _approve function for ERC20, by adding a bool emitEvent argument to the function that defaults to true. I've made the 3-argument variants in both contracts non-virtual because they are aliases of the 4-argument _approve.

No changeset because this is part of the ERC721 refactor.

Fixes #4547

[changeset-bot]

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Latest commit: 78cb272

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