withdrawFromQueue emits the wrong number of tokens withdrawn

[andreiashu]

Description

withdrawFromQueue can be called by anyone in order to withdraw deposited tokens from a round:

https://github.com/monoceros-alpha/review-opyn-perp-vault-templates-2021-07/blob/d94fcb2e2173008272604705a9fc618710349462/code/contracts/core/OpynPerpVault.sol#L305-L306

The emitted event is incorrectly using the withdrawQueueAmount variable which holds the tokens leftover in the queue to be withdrawn:

https://github.com/monoceros-alpha/review-opyn-perp-vault-templates-2021-07/blob/d94fcb2e2173008272604705a9fc618710349462/code/contracts/core/OpynPerpVault.sol#L464-L471

Recommendation

Fix the code to reference withdrawAmount instead which represents the number of tokens the user deposited in the round.