Configuration not applied on server when VIEWs view was disposed before submitting configuration json

### Bug Description:

Configuration is not applied on server when VIEWs view was disposed before submitting configuration json. The webview can be disposed by e.g. switching to the file explorer or minimizing the view. The toast message "Configuration submitted successfully" is shown nonetheless (with #366 nothing will be shown).

### Steps to Reproduce:
Follow steps in the video. See network tab of the developer tools that there is no config message sent to the trace server.


### Additional Information

- Operating System: Any
- VSCode Trace Extension Version: v0.7.0