Improvements for CardEmulation/CardReader sample

- Swap out launcher icons to use new Tap & Pay logo
- Call commit() after writing account number to preferences.

Change-Id: Icd31ade29aa0bd76790cdde7e6eb427362525f2a
(cherry picked from commit 3574a007282adaed638a733b772414a6146ddcf5)
9 files changed