(PUP-3268) Expand paths for env specs checking absolute paths on windows

Forgot five cases where we are testing absolute paths that an
environment instance will have expanded, and which on Windows platforms
will end with a leading drive letter.  File.expand_paths in the specs on
the expectation fixes this.
Merge branch 'issue/master/pup-3268-fix-windows-specs'

* issue/master/pup-3268-fix-windows-specs:
  (PUP-3268) Expand paths for env specs checking absolute paths on windows