Fix two confusing naming issues

android.R.string.yes is not "Yes" but "OK"; prefer android.R.string.ok for clarity
android.R.string.no is not "No" but "Cancel"; prefer android.R.string.cancel for clarity
Found by Error Prone.
Bug: 27723540

Change-Id: Ia6f58a7e7543ad1cc4e4722de8d095d1de8df034
1 file changed