Screenshot Module - error returns - incorrect padding | fix provided - read details

[Highpressure]

/server/modules/bot/screenshot.py

path is set to /tmp where normal user context has no write permission
this leads to "incorrect padding" error message when trying to create a screenshot

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