Expose keyUp event from modals to ActivityCallback

android/app/src/main/java/com/reactnativenavigation/controllers/Modal.java

 import android.content.DialogInterface;
 import android.os.Build;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.v7.app.AppCompatActivity;
+import android.view.KeyEvent;
 import android.view.Window;
 import android.view.WindowManager;
 
         getWindow().setAttributes(attributes);
     }
 
+    @Override
+    public boolean onKeyUp(int keyCode, @NonNull KeyEvent event) {
+        NavigationApplication.instance.getActivityCallbacks().onKeyUp(keyCode, event);
+        return super.onKeyUp(keyCode, event);
+    }
+
     @Override
     public void push(ScreenParams params, Promise onPushComplete) {
         layout.push(params, onPushComplete);