Inconsistent environments for `tape-run` and `tape-run -p`

[bsuh]

In my opinion the environment between tape-run and tape-run -p should be as close as possible. Yet, running with -p introduces stuff like source-map-support. This can be confusing as to why source maps might work with -p but not headless electron.

[juliangruber]

I agree, this is confusing, and ideally electron would have source map support too