Clean up even on error

[johanneskiesel]

Though this is now what I originally intended, someone is now running the entrypoint several times in a row. To support this, it would be necessary to clean up a bit more after an error occurs.

The critical spot seems to be here:

scriptor/lib/scripts.js

Line 76 in 4a9329f

const chainable = (true === await execution);

[johanneskiesel]

This also needs more killing (xvfb):

scriptor/lib/scripts.js

Line 352 in 4a9329f

showBrowserProcesses["lwm"].kill();