handle close request per state

src/yugecin/opsudance/states/EmptyRedState.java

@@ -65,6 +65,11 @@ public class EmptyRedState implements OpsuState {
 	public void leave() {
 	}
 
+	@Override
+	public boolean onCloseRequest() {
+		return true;
+	}
+
 	@Override
 	public boolean keyPressed(int key, char c) {
 		System.out.println("pressed");

src/yugecin/opsudance/states/EmptyState.java

@@ -62,6 +62,11 @@ public class EmptyState implements OpsuState {
 	public void leave() {
 	}
 
+	@Override
+	public boolean onCloseRequest() {
+		return true;
+	}
+
 	@Override
 	public boolean keyPressed(int key, char c) {
 		return false;