RTCDataChannelState.onDataChannelState is not called when data channel is closed on android

[derk1998]

Describe the bug
When a data channel or even the whole connection is closed, the data channel state callback is not triggered with the state RTCDataChannelClosed on android.

To Reproduce

• Create connection
• Connect with peer
• Open data channel
• Close the data channel
• Close the connection

Expected behavior
RTCDataChannelState.onDataChannelState is triggered with state RTCDataChannelClosed.

Platform information

• Flutter version: Channel stable, 3.19.2
• Plugin version: 1.2.1
• OS: Android
• OS version: 13