Merge #21572: Fix wrong wallet RPC context set after #21366

937fd4a Fix wrong wallet RPC context set after #21366 (Russell Yanofsky)

Pull request description:

  This bug doesn't have any effects currently because it only affects
  external signer RPCs which aren't currently using the wallet context,
  but it does cause an appveyor failure in a upcoming PR:

  https://ci.appveyor.com/project/DrahtBot/bitcoin/builds/38512882

  This bug is subtle and could have been avoided if JSONRPCRequest didn't
  have constructors that were so loose with type checking.  Suggested
  change
  bitcoin/bitcoin#21366 (comment)
  eliminates these and would be a good followup for a future PR.

  This PR just implements the simplest possible fix.

ACKs for top commit:
  theStack:
    Code-review ACK 937fd4a
  meshcollider:
    Code review ACK 937fd4a

Tree-SHA512: 53e6265ed6c7abb47d2b3e77d1604edfeb993c3a2440f0c19679cfeb23516965e6707ff486196a0acfbeff21c79a9a08b5cd33bae9a232d33d0134bca1bd0ff3

Author: MarcoFalke

src/wallet/interfaces.cpp

@@ -522,7 +522,7 @@ class WalletClientImpl : public WalletClient
 #ifdef ENABLE_EXTERNAL_SIGNER
         for (const CRPCCommand& command : GetSignerRPCCommands()) {
             m_rpc_commands.emplace_back(command.category, command.name, [this, &command](const JSONRPCRequest& request, UniValue& result, bool last_handler) {
-                return command.actor({request, m_context}, result, last_handler);
+                return command.actor({request, &m_context}, result, last_handler);
             }, command.argNames, command.unique_id);
             m_rpc_handlers.emplace_back(m_context.chain->handleRpc(m_rpc_commands.back()));
         }