POA-2904 Fix double close in redactor

[liujed]

Before:

[INFO] Running learn mode on interfaces lo, wlan0
[INFO] Send SIGINT (Ctrl-C) to stop...
^C[INFO] Received interrupt, stopping trace collection...
panic: close of closed channel

After:

[INFO] Running learn mode on interfaces lo, wlan0
[INFO] Send SIGINT (Ctrl-C) to stop...
^C[INFO] Received interrupt, stopping trace collection...
[INFO] Trace collection stopped
[INFO] Did not capture any TCP packets matching the filter. This may mean your filter is incorrect, such as the wrong TCP port.
[ERROR] No HTTP calls captured! 🛑

[ERROR] Error during initiaization: API trace is empty
[INFO] This process will not exit, to avoid boot loops. Please correct the command line flags or environment and retry.