Don't clear padding of content view from ActionBarOverlayLayout

The previous commit, 7d409b07, would
accidentally clear the padding set to the content view (id/content).
This CL prevents that to make the behavior compatible.

Fix: 345480675
Bug: 343131420
Bug: 309578419
Flag: com.android.window.flags.enforce_edge_to_edge
Test: atest ActionBarOverlayLayoutTest
Change-Id: I63b0ea99e951f80da60ede1d4ab5b42cf057eb0e