init: Remove deprecated args from hidden args

src/httpserver.cpp

@@ -352,13 +352,6 @@ bool InitHTTPServer()
     if (!InitHTTPAllowList())
         return false;
 
-    if (gArgs.GetBoolArg("-rpcssl", false)) {
-        uiInterface.ThreadSafeMessageBox(
-            "SSL mode for RPC (-rpcssl) is no longer supported.",
-            "", CClientUIInterface::MSG_ERROR);
-        return false;
-    }
-
     // Redirect libevent's logging to our own log
     event_set_log_callback(&libevent_log_cb);
     // Update libevent's log handling. Returns false if our version of