restore boss heart container bouncing physics

src/dusk/mods/item_actor.cpp

@@ -0,0 +1,15 @@
+#include "item.hpp"
+
+namespace dusk::mods {
+
+static BossItemActorSpeeds bossItemActorSpeeds{};
+void set_boss_item_actor_speeds(f32 f, f32 y) {
+    bossItemActorSpeeds.f = f;
+    bossItemActorSpeeds.y = y;
+}
+
+BossItemActorSpeeds get_boss_item_actor_speeds() {
+    return bossItemActorSpeeds;
+}
+
+}