fix: Request keyframes from last-n endpoints for newly joined video channels #380
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As users join a meeting with last-n enabled they need to request
keyframes from the currently forwarded endpoints in order to
begin receiving video. Prior to this change a user joining the
meeting, that did not result in an update to the last-n endpoints,
would not receive keyframes for the forwarded endpoints. The
result was the newly joined user being unable to display video
until a dominant speaker event, pinned endpoint event, or
the next keyframe interval occurred.