log: Remove "No rpcpassword set" from logs

src/httprpc.cpp

@@ -249,7 +249,7 @@ static bool InitRPCAuthentication()
 {
     if (gArgs.GetArg("-rpcpassword", "") == "")
     {
-        LogPrintf("No rpcpassword set - using random cookie authentication.\n");
+        LogPrintf("Using random cookie authentication.\n");
         if (!GenerateAuthCookie(&strRPCUserColonPass)) {
             uiInterface.ThreadSafeMessageBox(
                 _("Error: A fatal internal error occurred, see debug.log for details"), // Same message as AbortNode