Update stream settings pop-up on receiving subscription events

[kaustubh-nair]

Currently, the stream settings pop-up is not updated after receiving pin/mute stream events. This causes a mismatch between the stream state and the pop-up checkbox state when the settings are updated elsewhere when the pop-up is open in a ZT instance.

This can likely be fixed by using an absolute state instead of just toggling from previous state in the checkbox callbacks.

[neiljp]

The absolute state change would avoid mismatch, but updating the checkboxes directly would be the next step.