SystemUI: Revert some Tuner changes

These changes were done to start the status bar tuner directly without
showing the main Tuner screen. However, they negatively affect the
management of the fragments. Revert them so that a different solution
can be implemented in a follow-up change.

This reverts the following commits:

 - 338de672
   "Handle onOptionsItemSelected for TunerActivity"

 - b3eba6af
   "SystemUI: Remove nav bar and status bar options from SystemUI Tuner"

 - 82b9f95f (partially)
   "systemui: Fix a few issues with Tuner"

BUGBASH-661

Change-Id: I35182248566ff31ed08d2836d66d5bd3f947ee9a