filter: hide warning when disconnecting pins drops frames

Sometimes this hints that there's a bug, but sometimes it's normal.

Since the code for --end/--frames puts frames that should not be shown
anymore back into the pin, using those options will show this warning
when playback ends. This is a minor annoyance. We could change how it's
done (e.g. set an explicit flag somewhere), but that seems bothersome,
so just change the message from warning to verbose.

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