Refactor ERC4626Fees example to account for fees in maxWithdraw

[ernestognw]

Alternative to #5130

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[cairoeth]

looks good -- as we have the testing suite for ERC4626Fees already set up, maybe we want to add a unit test for maxWithdraw? alternatively, we can add the tests on the community repo

[cairoeth]

Suggested change

	/// @dev Maximum amount of the underlying asset that can be withdrawn from the owner's balance.
	/// @dev Maximum amount of the underlying asset that can be withdrawn from the owner's balance after subtracting fees.

[Amxx]

IMO, we should do the change in ERC4626, not in ERC4626Fees.