fix(volume-osd): drop the plasma-browser-integration duplicate too

playerctld was not the only proxy. plasma-browser-integration republishes a
browser tab under its own bus name, so a playing Navidrome tab in Firefox
was live on three names at once: firefox.instance_*, the plasma name, and
playerctld. Only the first was being filtered, so two entries survived for
one track and the transport buttons went to whichever sorted first.

Safe to drop because none of the three bus names exists until playback
starts, and the browser's own entry was present whenever the plasma one
was, measured across two play sessions. An open but silent tab publishes
nothing, so there is no row to lose.

Also records what Navidrome does not provide: no mpris:artUrl, which is why
the row shows no cover and is not a bug on this side, and everything packed
into xesam:title with xesam:artist left empty. Neither is worked around,
splitting such a title needs guessing where a real dash ends.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TvHeJEXJzdfAaCCYqURAWp

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