Settings: Always show settings button option for notification drawer (2/2)

This also fixes a bug where the settings button was not showing the proper pressed drawable
and fixes the transparency on the ic_notify_settings_normal drawable to match the rest of the
notification drawer assets.

Also removes longpress PW toggle setting since it now defaults to this.

Change-Id: I87167563b0abe346332636e7567accf11ef61b06