Settings: remove always transparency mode navbar/statusbar (1/2) + Settings: rework navbar and statusbar transparency/color handling (2/2)

problem is that the transparency on most app totally break due
that a lot apps do not draw behind navbar and statusbar. Nearly
all user never use always mode and just use it on launcher
and lockcreen. So let us remove it

as well a bit cleanup in arrays and strings

Change-Id: Ic6d65d96a6665071689f3bc607c11aeadd29d8b8