Webcam Module - not working | fix provided - read details

[Highpressure]

/server/modules/bot/webcam.py

path is set to /tmp where normal user context has no write permission
this leads to error when trying to create a screenshot, or just no image beeing fetched.

changing to directory where user has permission (e.g. home directory or /var/tmp) will fix the issue.
tested on MacOS Big Sur.

Created branch with pull request if not getting applied here.