videoReceiver.getSsrcInternalMap read asAny._map, but @discordjs/voice
0.19.x exposes the SSRC map as the public field 'map'. So inferVideoOwner
(e.g. matching a video RTP SSRC to a user via audio-SSRC proximity) always
returned null -> every video packet was silently dropped after decryption.
Accept both 'map' and '_map'. Unblocks camera/screen-share attribute when
op12 does not carry a videoSSRC stream entry.