Re-add the ad-hoc command the was removed by mistake in the previous commit

Thank you, e2e tests

louloulibs/xmpp/adhoc_commands_handler.cpp

@@ -17,6 +17,9 @@ const std::map<const std::string, const AdhocCommand>& AdhocCommandsHandler::get
 
 void AdhocCommandsHandler::add_command(std::string name, AdhocCommand command)
 {
+  const auto found = this->commands.find(name);
+  if (found != this->commands.end())
+    throw std::runtime_error("Trying to add an ad-hoc command that already exist: "s + name);
   this->commands.emplace(std::make_pair(std::move(name), std::move(command)));
 }
 

src/xmpp/biboumi_component.cpp

@@ -59,7 +59,7 @@ BiboumiComponent::BiboumiComponent(std::shared_ptr<Poller> poller, const std::st
   this->adhoc_commands_handler.add_command("ping", {{&PingStep1}, "Do a ping", false});
   this->adhoc_commands_handler.add_command("hello", {{&HelloStep1, &HelloStep2}, "Receive a custom greeting", false});
   this->adhoc_commands_handler.add_command("disconnect-user", {{&DisconnectUserStep1, &DisconnectUserStep2}, "Disconnect selected users from the gateway", true});
-  this->adhoc_commands_handler.add_command("hello", {{&HelloStep1, &HelloStep2}, "Receive a custom greeting", false});
+  this->adhoc_commands_handler.add_command("disconnect-from-irc-server", {{&DisconnectUserFromServerStep1, &DisconnectUserFromServerStep2, &DisconnectUserFromServerStep3}, "Disconnect from the selected IRC servers", false});
   this->adhoc_commands_handler.add_command("reload", {{&Reload}, "Reload biboumi’s configuration", true});
 
 #ifdef USE_DATABASE