SystemUI: Fix percentage charging color does not apply

How to reproduce:
Set colors to default. Try to set only charging color.

Result:
- nothing happens when you try to charge and it is out of the max and min levels

Expected behaviour
- user choosen color applies if the user charges and it is outside the max min levels

The JB style icon which was recently introduced broke the logic completely. Clean it a
bit up and apply the colors correctly depending on the choosen style.

NOTE for the future: We have since the JB style patch 2 different behaviours....text has now indication
during charge when it is outside the min max levels. All circle styles do not have this
indication. Nothing big but we are usually consistent and should think about it.

Whatever functioniallity wise it is fixed

Change-Id: I5029d09fbf1a7e4181b082ad55d9607bcf8a63cc
TRDS: Fix Volume panel background

Volume panel is a bit out of the box compared to the normal theming.
Reapply the background via java code on theme change.

Change-Id: I0df41a95487f7c23d5fda5c2ec7df763c8e2f466
Revert "Slim Recents: Also restore expanded state of topmost task on homescreen"

This reverts commit 0df9b999c2bd8769b14ad2a5c54dd969d12e56b3.
Revert "Slim Recents: Always show topmost task collapsed"

This reverts commit 5770cc380514f77b036dcfc69819755212c7a61a.
Slim Recents: Always show topmost task collapsed

PS2: Also restore expanded state of topmost task when on homescreen
PS3: Fix code style

Change-Id: I64956410fb389d8e880979a84b51321d8b372217
SlimRecents: Rework show top most task feature

recently introduced this feature needed a bit rework. Basic changes

- do not call settings provider on every preload to prevent high IO work.
  Use our observer for that
- Use internal flag logic to mark topmost task
- Move interpretation of the expanded state into the card
- Due that topmost task is always collapsed do not show expanded icon at all
- Minor cleanup

PS:
- set mFirstTask to null if it is not used

Change-Id: Ifaabc035b6b9bd2d4527d5b34a1bca9c80a74e32