fix -Wunused-lambda-capture

src/graphics/ui/elements/Container.cpp

@@ -96,7 +96,7 @@ void Container::act(float delta) {
     GUI& gui = this->gui;
     intervalEvents.erase(std::remove_if(
         intervalEvents.begin(), intervalEvents.end(),
-        [&gui](const IntervalEvent& event) {
+        [](const IntervalEvent& event) {
             return event.repeat == 0;
         }
     ), intervalEvents.end());