Remove use of CRPCTable::appendCommand in wallet code

This commit does not change behavior.

src/test/rpc_tests.cpp

@@ -31,10 +31,9 @@ UniValue CallRPC(std::string args)
     request.strMethod = strMethod;
     request.params = RPCConvertValues(strMethod, vArgs);
     request.fHelp = false;
-    BOOST_CHECK(tableRPC[strMethod]);
-    rpcfn_type method = tableRPC[strMethod]->actor;
+    if (RPCIsInWarmup(nullptr)) SetRPCWarmupFinished();
     try {
-        UniValue result = (*method)(request);
+        UniValue result = tableRPC.execute(request);
         return result;
     }
     catch (const UniValue& objError) {