Settings : Fix profile force close

Don't reinstantiate mTabManager, otherwise previous reference to
container is lost and fragment manager fails to find the container view
upon rebinding.

To reproduce :

Open settings
Click profiles
Click to customize a profile/application group
Click on another preference in side pane (Display for eg)

Note : Only occurs in tablet view

Change-Id: Iaaac19e3e1cbcf6282b93319fd31aa328c70b97f