Gas Optimizations

[code423n4]

> 0 IS LESS EFFICIENT THAN != 0 FOR UINT IN require STATEMENT

!=0 costs less gas than >0 for uint in require statement.

Proof: While it may seem that >0 is cheaper than !=, this is only true if the optimizer is enabled and declared outside the require statement. If you enable the optimizer at 10k and declare it in require statement, this will save gas. you can see this tweet for more proof:
https://twitter.com/gzeon/status/1485428085885640706

I suggest to changing >0 with !=0 here (and also enable the optimizer):

https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraLocker.sol#L210
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraLocker.sol#L259
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraLocker.sol#L359
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraLocker.sol#L385
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraLocker.sol#L431
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraLocker.sol#L471
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraLocker.sol#L851
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraBalRewardPool.sol#L139
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraBalRewardPool.sol#L210
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/Aura.sol#L68
https://github.com/code-423n4/2022-05-aura/blob/main/contracts/AuraVestedEscrow.sol#L118