Fixed _removeConnection where connection was removed but id remained …

[SharkSharp]

In _removeConnection, when the connection is removed, it is not checked if there are still active connections on that id, thus leaving an id with no connections in the connection list, which seems wrong to me

In negotiator, when peerConnection.iceConnectionState becomes "disconnected" the method this.connection.close(); is not called, giving no close event in the connection, which seems wrong to me

Signed-off-by: Arthur Frederico Neves [email protected]

[jonasgloning]

Hey @SharkSharp, thanks for the PR! Currently testing on the rc branch.