Unmount ReactRootView even if it's hidden

There was an issue where ReactRootView was not unmounted if it was destroyed when it was hidden.

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/ViewController.java

@@ -189,9 +189,9 @@ public abstract class ViewController<T extends ViewGroup> implements ViewTreeObs
         if (isShown) {
             isShown = false;
             onViewDisappear();
-            if (view instanceof Destroyable) {
-                ((Destroyable) view).destroy();
-            }
+        }
+        if (view instanceof Destroyable) {
+            ((Destroyable) view).destroy();
         }
         if (view != null) {
             view.getViewTreeObserver().removeOnGlobalLayoutListener(this);

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/ViewControllerTest.java

@@ -189,6 +189,22 @@ public class ViewControllerTest extends BaseTest {
         verify(spy, times(1)).onViewDisappear();
     }
 
+    @Test
+    public void onDestroy_destroysViewEvenIfHidden() {
+        final SimpleViewController.SimpleView[] spy = new SimpleViewController.SimpleView[1];
+        ViewController uut = new SimpleViewController(activity, childRegistry, "uut", new Options()) {
+            @Override
+            protected SimpleView createView() {
+                SimpleView view = spy(super.createView());
+                spy[0] = view;
+                return view;
+            }
+        };
+        assertThat(uut.isViewShown()).isFalse();
+        uut.destroy();
+        verify(spy[0], times(1)).destroy();
+    }
+
     @Test
     public void onDestroy_RemovesSelfFromParentIfExists() {
         LinearLayout parent = new LinearLayout(activity);