The `destroy` method in some actors would throw errors or was incomplete,
leading to various issues closing the toolbox after the previous patch.
This cleans up all such cases noticed through manual testing of the toolbox.
MozReview-Commit-ID: 6EZYFwjSri
For simple rules like function spacing, we can auto-fix these across the code
base so they are followed in a consistent way.
To generate this patch, I ran:
./mach eslint devtools --no-ignore --fix
After this, I reverted any changes to third party files that we really do want
to ignore.
MozReview-Commit-ID: 6Q8BApkAW20
