Merge #17584: wallet: replace raw pointer with const reference in AddrToPubKey

1a3a256d5e0443d19757c1f1fceb9c9ede17758a wallet: replace raw pointer with const reference in AddrToPubKey (Harris)

Pull request description:

  This PR replaces a redundant reference-to-pointer conversion in **addmultisigaddress** from *wallet/rpcwallet.cpp*. It also makes the API from *rpc/util.h* look more straightforward as **AddrToPubKey** now uses const references like other functions from there.

  I am not sure why there is a ref-to-ptr conversion in addmultisignatures, so I can only speculate that this is because of "historical reasons".

  The ref-to-ptr conversion happens here: https://github.com/bitcoin/bitcoin/blob/master/src/wallet/rpcwallet.cpp#L1001

  There, the address of LegacyScriptPubKeyMan& is given to AddrToPubKey.

  Later, in AddrToPubKey, it gets converted back to a reference, because GetKeyForDestination in rpc/util.cpp expects a const ref: https://github.com/bitcoin/bitcoin/blob/master/src/rpc/util.cpp#L140

  Regards,

ACKs for top commit:
  achow101:
    ACK 1a3a256d5e0443d19757c1f1fceb9c9ede17758a
  meshcollider:
    utACK 1a3a256d5e0443d19757c1f1fceb9c9ede17758a
  promag:
    Code review ACK 1a3a256d5e0443d19757c1f1fceb9c9ede17758a.
  hebasto:
    ACK 1a3a256d5e0443d19757c1f1fceb9c9ede17758a, I have not tested the code, but I have reviewed it and it looks OK, I agree it can be merged.

Tree-SHA512: 1a2b8ddab5694ef4c65fac69f011e38dd03a634e84a35857e13bd05ad99fe42af22ee0af6230865e3d2c725693512f3336acb055ede19c958424283e7a3856c4

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