fix(protocol): fix ERC20Airdrop2.sol with an extended withdrawal window

[dantaik]

code-423n4/2024-03-taiko-findings#245

@adaki2004 Dani, please take a look at the bug report above...

OR we simply delete this contract if ERC20Airdrop is to be used by genesis airdop.

[openzeppelin-code]

fix(protocol): fix ERC20Airdrop2.sol with an extended withdrawal window

Generated at commit: 0013c194536ed2395060d5e0a266819c57948176

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	2 2 0 3 39 46
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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For more details view the full report in OpenZeppelin Code Inspector

[adaki2004]

code-423n4/2024-03-taiko-findings#245

@adaki2004 Dani, please take a look at the bug report above...

OR we simply delete this contract if ERC20Airdrop is to be used by genesis airdop.

Well, we haven't paid too much attention to version 2, because v1 will be used with genesis. But Trailblazer could still use this type and personally i think it should !
(Will adjust the failing test).