VSCode output opens automatically on startup

After I quit VSCode, when I open a new window the output panel opens automatically with this message:

```
⸻ Slither: Solidity static analysis framework by Trail of Bits ⸻
Using slither version: 0.9.1
Refreshing explorer...
Loaded 136 issues, displaying 136
```

Originally, I thought this was an issue with another configuration, but after disabling the slither extension (inspired by a suggestion from: https://github.com/microsoft/vscode/issues/34221#issuecomment-329176447) the issue does not persist.