Made up/down button pairs not holdable

demos/optical_bench/src/menu_helper.hpp

@@ -41,7 +41,6 @@ class MenuHelper {
                                    float increments, float min, float max,
                                    phx::Entity* parent,
                                    std::function<void(float)> change) {
-
     auto text_entity = scene->CreateEntity();
     text_entity->AddComponent<phx::Transform>()
         ->Translate(glm::vec3(-0.001f, offset_y, -0.085f + offset_x))
@@ -82,6 +81,9 @@ class MenuHelper {
     down->GetTransform()->SetParent(parent->GetFirstComponent<phx::Transform>(),
                                     false);
 
+    up->SetHoldable(false);
+    down->SetHoldable(false);
+
     up->GetTransform()->SetLocalRotationEuler(glm::vec3(0, -90, 90));
     down->GetTransform()->SetLocalRotationEuler(glm::vec3(0, 90, 90));
     up->GetTransform()->SetLocalScale(glm::vec3(0.03f, 0.01f, 0.03f));