Don't remove sys.path[0].

[zuckerruebe]

Fixes #2053.

[zuckerruebe]

Hi @davidhalter

Continuing our discussion in #2053, it seems just deleting the del sys.path[0] line passes the tests. Whether you want to go with the safer "only delete first entry if it's the empty string" only you can decide...

[davidhalter]

Thanks. I feel like this is fine. Time will tell if there are going to be issues, but it definitely does not look necessary anymore in the general case.