Fix Drawer selection and initial Header

- now select the correct header when launching Settings shortcuts by
taking care of initial header
- also fix an issue when having to "double BACK" on the initial header
- some code cleaning (no need to test non null references)
- move code to group it by topics

Change-Id: Ifdf6dd7f5605e858b324d00165f0a5e8124efdfc
1 file changed