Utilize isSeparating for better foldable device support.

app/src/main/java/org/thoughtcrime/securesms/WebRtcCallActivity.java

@@ -836,7 +836,7 @@ public class WebRtcCallActivity extends BaseActivity implements SafetyNumberChan
       if (feature.isPresent()) {
         FoldingFeature foldingFeature = (FoldingFeature) feature.get();
         Rect           bounds         = foldingFeature.getBounds();
-        if (foldingFeature.getState() == FoldingFeature.State.HALF_OPENED && bounds.top == bounds.bottom) {
+        if (foldingFeature.isSeparating()) {
           Log.d(TAG, "OnWindowLayoutInfo accepted: ensure call view is in table-top display mode");
           viewModel.setFoldableState(WebRtcControls.FoldableState.folded(bounds.top));
         } else {