Report inner interrupt controller as identity for managed one.

src/main/java/li/cil/oc2/common/vm/ManagedInterruptController.java

@@ -21,6 +21,11 @@ public final class ManagedInterruptController implements InterruptController {
         raisedInterrupts = 0;
     }
 
+    @Override
+    public Object getIdentity() {
+        return interruptController.getIdentity();
+    }
+
     @Override
     public void raiseInterrupts(final int mask) {
         if (!isValid) {