Remove custom function allowance

[rya-sge]

In ERC20BaseModule, we have a function approve(address spender,uint256 amount,uint256 currentAllowance) to be used to avoid the vulnerability describes here: google doc

With OpenZeppelin v4.x, this functions was not necessary since we could use the functions increaseAllowance and decreaseAllowance
Nevertheless, these two functions will be remove in the next OpenZeppelin release.

The reason behind this change should be to make us think if our custom approve function is really necessary, see OpenZeppelin/openzeppelin-contracts#4583

For example, Metamak put a warning with the standard approve function

But it is not the case for the custom approval function, which thus can be use to scam token holders