fix claimDelayedWithdrawals to not pull on its own #44
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Since DelayedWithdrawalRouter.claimDelayedWithdrawals can be called by anyone.
Existing logic assumes it's permissioned (it's not).
Refactor code so that you can support that assuming anyone can call it.
The way to solve that is to register withdrawn validators before pulling the funds.
This way you don't tax principal and it's just put back into the pool