Wallet is not an accounts.Wallet anymore

[Oliver Tale-Yazdi]

After my last MR (#13) was merged, i noticed that Wallet does not fulfill the accounts.Wallet interface from geth anymore.
This was not indented but slipped under the radar.

I will prepare another MR to fix it. The baseFee is not even used for signing but to verify the signature, which can also be done without it.
So my next MR (#16) will effectively revert #13, get rid of the AsMessage function by using Sender instead and add a type assertion.

Sorry for the inconvenience 🙏

[miguel]

Ah I see, understood 👍

Mistake on my end as well for not verifying that new changes continue to implement the interface.

The latest PR looks good and I don't see any problems with merging it.

Thanks again @ggwpez

[miguel]

Closed by #16