Update Chain ID for testnet domain hash calculation in withdrawal signing

[nkuba]

We update the Chain ID defined for the testnet domain used in the withdrawal transaction
hash calculation.

The value has to match the Sepolia Chain ID, which is 11155111 (0xaa36a7).
Previously, we used 1115511 (0x110577), which was a typo.

It is expected that for testnet the data:

{
  to: "0xc14972DC5a4443E4f5e89E3655BE48Ee95A795aB",
  value: "0x0",
  data: "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",
  operation: 0,
  safeTxGas: "0x0",
  baseGas: "0x0",
  gasPrice: "0x0",
  gasToken: "0x0000000000000000000000000000000000000000",
  refundReceiver: "0x0000000000000000000000000000000000000000",
  nonce: 8,
}

will result in the transaction hash:

0xa580c0c5a0b8e731f7b7fe8ea3ee41cf0dbe78b352b55ae090160659e2d7410c

Helper calculation script: https://gist.github.com/nkuba/6e112d736077827362102f7bd93e5cea