fix: correct RedeemRequest event param from assets to shares (#822)

the RedeemRequest event in IERC7540Redeem had `assets` as the last
param, but per EIP-7540 spec it should be `shares`. redeem operates on
shares, deposit operates on assets - the event was copy-pasted wrong.

ref: https://eips.ethereum.org/EIPS/eip-7540#events

Co-authored-by: zerosnacks <95942363+zerosnacks@users.noreply.github.com>

Author: davidjsonn

src/interfaces/IERC7540.sol

@@ -99,7 +99,7 @@ interface IERC7540Deposit is IERC7540Operator {
 /// https://eips.ethereum.org/EIPS/eip-7540
 interface IERC7540Redeem is IERC7540Operator {
     event RedeemRequest(
-        address indexed controller, address indexed owner, uint256 indexed requestId, address sender, uint256 assets
+        address indexed controller, address indexed owner, uint256 indexed requestId, address sender, uint256 shares
     );
 
     /**