Enable module in start funcion (#2538)

Before it was enabled by default. That means if the constructor fails,
the destructor will complain that the module was not stopped before
deconstructing.

We can't just call stop if module creation fails because the module is
only partially initialized.

src/modules/ipc.cpp

@@ -68,6 +68,7 @@ namespace modules {
    * Start module and run first defined hook if configured to
    */
   void ipc_module::start() {
+    this->module::start();
     m_mainthread = thread([&] {
       m_log.trace("%s: Thread id = %i", this->name(), concurrency_util::thread_id(this_thread::get_id()));
       update();