Switch Camoufox template to the new Camoufox base Docker image

[barjin]

https://github.com/apify/apify-actor-docker/pull/164/ adds a new Apify-managed Docker image with preinstalled Camoufox.

This is more space-efficient than the currently used Chrome base image with Camoufox additionally installed. We should switch the base image in the Camoufox template to the new base image (and likely remove some other unnecessary parts of the template Dockerfile).