Fix false-positive unused lambda capture in ecs::dispatcher

libs/ecs/include/psemek/ecs/dispatcher.hpp

@@ -3,6 +3,7 @@
 #include <psemek/ecs/container.hpp>
 #include <psemek/util/hash_table.hpp>
 #include <psemek/util/function.hpp>
+#include <psemek/util/unused.hpp>
 
 namespace psemek::ecs
 {
@@ -50,6 +51,7 @@ namespace psemek::ecs
 				}
 				else
 				{
+					unused(this);
 					handler(event);
 				}
 			});