Specify tint on top-level vector tag, rather than fillColor

Ensures that setting the tint programatically or from a view XML
attribute works as expected, masking against a solid color rather
than a non-opaque theme color.

Also specifies missing tint on ic_audio_ring_notif.

Change-Id: Ib65e41eb23c5e5a2f44264ee32681f7ac943ecc4