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Fix CSS selector for <track-info-panel> element, CSS uses a different
syntax for Polymer :host pseudo-element with attributes selector.

I used code search for all ":host" entries and only this file is using
the incorrect syntax.

There is no change in behaviour, only styles have changed.

Test: Checked manually/visually Audio Player.
Bug: 896056
Change-Id: Id93eb2460a8370dfc1e2488e335bdfac3c4067e7
Reviewed-on: https://chromium-review.googlesource.com/c/1295629
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601857}