Make icon sizes consistent

Updating sizes of icon based on code review discussion in ag/12013470.

Bug: 159990829
Test: manual - Verify icons (app and device) are same size in media
player.
Test: manual - Verify fallback device icon and app icon are the same
size.

Change-Id: I7dd12145ecdb96bdf4a7dc4e6e095e306453633b