Hide shelf in 2-Button Landscape

Disable overview rotation in 2-Button.

Fixes: 154181816
Test: Tested no button and 2 button,
overview actions worked as before.

Change-Id: Ic22c791c7a93460840d54aaf0bf32884cc110e19

src/com/android/launcher3/InsettableFrameLayout.java

@@ -91,6 +91,9 @@ public class InsettableFrameLayout extends FrameLayout implements Insettable {
     @Override
     public void onViewAdded(View child) {
         super.onViewAdded(child);
+        if (!isAttachedToWindow()) {
+            return;
+        }
         setFrameLayoutChildInsets(child, mInsets, new Rect());
     }