[nrfconnect] Fixed sending light switch off command (#17110)

There is a bug that results in sending on command id after
invoking off command.

Fixed a bug to send off command id.

Tested manually that that sent command ids are correct.

examples/light-switch-app/nrfconnect/main/BindingHandler.cpp

@@ -89,7 +89,7 @@ void BindingHandler::OnOffProcessCommand(CommandId aCommandId, const EmberBindin
         else
         {
             Messaging::ExchangeManager & exchangeMgr = Server::GetInstance().GetExchangeManager();
-            ret = Controller::InvokeGroupCommandRequest(&exchangeMgr, aBinding.fabricIndex, aBinding.groupId, onCommand);
+            ret = Controller::InvokeGroupCommandRequest(&exchangeMgr, aBinding.fabricIndex, aBinding.groupId, offCommand);
         }
         break;
     default: