NetworkTraffic: Resolve status bar indicators tints

 * Apply the color tint with PorterDuff.Mode.MULTIPLY
    as the original color is white, with transparencies

 * Use the DarkReceiver tint's value as icons tint

 * Results: Before and after: https://ibb.co/k15ony

 * Test: Bright wallpaper with status bar contrasts:
    https://ibb.co/dxupSy

Change-Id: I4f31cf5a9a3db4018543603a891fa7967ccbb4a3