Updated Wi-Fi Settings icons to new filled-in teal format.

+ Added a filled-in teal Wi-Fi unlocked and locked icons.
+ Added a teal theme to Settings.
+ Updated Wi-Fi Settings and Setup Wizard to use the new teal format.
+ Updated the Settings icon (used in the Settings dashboard and in
search) to the new format.

Bug: 17331199
Change-Id: I0565ef6f2fa1be035c1bd150ea853cb976dc504c