Settings: Overwork some features

Make Quick Pulldown array properly
For example, when you set left position and you'll get
'Position: Left edge of the status bar pulls down Quick Settings.
but if you set off and you'll get just 'off'

Clean up some strings (Ambient style)

Volume Step Control: You can choose reboot or no by alertdialog

Fix some bugs that doesn't updated properly

Change-Id: Ia9056de83fe85bfc20d658be7963d0fe991350f2