Update test image for upated nav icons.

The image shows the nav icons to be separated by a significant distance.
This is because the switch to wide-screen layout happens based on
shortest width. The layout has a small shortest width and hence it uses
the phone layout for a horizontal nav bar and it doesn't look nice. Real
devices will never have this config, so it's okay.

Change-Id: Ic494ee7fdfb1116db39bcab6d6ee7a1e514b23df