Update the color of security status icons

Also update res/drawable/ic_ota_update_none.xml to have the same
contents as res/drawable/ic_ota_update_stale.xml.

Bug: 74255242
Test: manual (go to Settings->Security & location; the icons in the
Security status section at the top should be colorful)

Change-Id: I1c54c5b6803268e3acf9720c7c555476405d624e