fix(proxy-target): underlyingRedeemed calculations in removeLiquidityAndRedeem

[surbhiaudichya]

• Call denormalize instead of normalize to calculate how much underlying will be redeemed.
• Pass the correct param to hToken.redeem; i.e., underlyingRedeemed instead of hTokenReturned.
• Relay any remaining hTokens to the end user; because hTokenReturned was denormalized to underlyingRedeemed, offsetting the trailing 12 digits.