mplayer: don't clear OSD when new file is played

When switching editions, it would be nice to display an OSD message to
notify the user which edition is being played. This would be consistent
with visual feedback like on tracking switching, seeking, and so on.

Rather than introducing awkward hacks and special cases to determine
whether a file is being "restarted" (as it happens on edition switching)
to avoid clearing the OSD messages, simply never clear the OSD stack.

This is more consistent with handling of OSD bars too: they didn't
disappear when going to a new file (especially noticable when seeking
past the end of the file).

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